Aristotle's scientific method

Aristotle

Aristotle (Greek: Ἀριστοτέλης, Aristotélēs) (384 BC – 322 BC) was a Greek philosopher and polymath, a student of Plato and teacher of Alexander the Great. His writings cover many subjects, including physics, metaphysics, poetry, theater, music, logic, rhetoric, linguistics, politics, government, ethics, biology, and zoology. Together with Plato and Socrates (Plato's teacher), Aristotle is one of the most important founding figures in Western philosophy. Aristotle's writings were the first to create a comprehensive system of Western philosophy, encompassing morality and aesthetics, logic and science, politics and metaphysics.
Aristotle's views on the physical sciences profoundly shaped medieval scholarship, and their influence extended well into the Renaissance, although they were ultimately replaced by Newtonian physics. In the zoological sciences, some of his observations were confirmed to be accurate only in the 19th century. His works contain the earliest known formal study of logic, which was incorporated in the late 19th century into modern formal logic. In metaphysics, Aristotelianism had a profound influence on philosophical and theological thinking in the Islamic and Jewish traditions in the Middle Ages, and it continues to influence Christian theology, especially the scholastic tradition of the Catholic Church. His ethics, though always influential, gained renewed interest with the modern advent of virtue ethics. All aspects of Aristotle's philosophy continue to be the object of active academic study today. Though Aristotle wrote many elegant treatises and dialogues (Cicero described his literary style as "a river of gold"),[2] it is thought that the majority of his writings are now lost and only about one-third of the original works have survived.

Aristotle 

Aristotle is a towering figure in ancient Greek philosophy, making contributions to logic, metaphysics, mathematics, physics, biology, botany, ethics, politics, agriculture, medicine, dance and theatre. He was a student of Plato who in turn studied under Socrates. He was more empirically-minded than Plato or Socrates and is famous for rejecting Plato’s theory of forms.

As a prolific writer and polymath, Aristotle radically transformed most, if not all, areas of knowledge he touched. It is no wonder that Aquinas referred to him simply as “The Philosopher.” In his lifetime, Aristotle wrote as many as 200 treatises, of which only 31 survive. Unfortunately for us, these works are in the form of lecture notes and draft manuscripts never intended for general readership, so they do not demonstrate his reputed polished prose style which attracted many great followers, including the Roman Cicero. Aristotle was the first to classify areas of human knowledge into distinct disciplines such as mathematics, biology, and ethics. Some of these classifications are still used today.

As the father of the field of logic, he was the first to develop a formalized system for reasoning. Aristotle observed that the validity of any argument can be determined by its structure rather than its content. A classic example of a valid argument is his syllogism: All men are mortal; Socrates is a man; therefore, Socrates is mortal. Given the structure of this argument, as long as the premises are true, then the conclusion is also guaranteed to be true. Aristotle’s brand of logic dominated this area of thought until the rise of modern propositional logic and predicate logic 2000 years later.

Aristotle’s emphasis on good reasoning combined with his belief in the scientific method forms the backdrop for most of his work. For example, in his work in ethics and politics, Aristotle identifies the highest good with intellectual virtue; that is, a moral person is one who cultivates certain virtues based on reasoning. And in his work on psychology and the soul, Aristotle distinguishes sense perception from reason, which unifies and interprets the sense perceptions and is the source of all knowledge.

Aristotle famously rejected Plato’s theory of forms, which states that properties such as beauty are abstract universal entities that exist independent of the objects themselves. Instead, he argued that forms are intrinsic to the objects and cannot exist apart from them, and so must be studied in relation to them. However, in discussing art, Aristotle seems to reject this, and instead argues for idealized universal form which artists attempt to capture in their work.

Aristotle was the founder of the Lyceum, a school of learning based in Athens, Greece; and he was an inspiration for the Peripatetics, his followers from the Lyceum.

Logic & History

With the Prior Analytics, Aristotle is credited with the earliest study of formal logic, and his conception of it was the dominant form of Western logic until 19th century advances in mathematical logic. Kant stated in the Critique of Pure Reason that Aristotle's theory of logic completely accounted for the core of deductive inference.

Aristotle "says that 'on the subject of reasoning' he 'had nothing else on an earlier date to speak of'". However, Plato reports that syntax was devised before him, by Prodicus of Ceos, who was concerned by the correct use of words. Logic seems to have emerged from dialectics; the earlier philosophers made frequent use of concepts like reductio ad absurdum in their discussions, but never truly understood the logical implications. Even Plato had difficulties with logic; although he had a reasonable conception of a deductive system, he could never actually construct one and relied instead on his dialectic. Plato believed that deduction would simply follow from premises, hence he focused on maintaining solid premises so that the conclusion would logically follow. Consequently, Plato realized that a method for obtaining conclusions would be most beneficial. He never succeeded in devising such a method, but his best attempt was published in his book Sophist, where he introduced his division method.

Aristotle's scientific method

Like his teacher Plato, Aristotle's philosophy aims at the universal. Aristotle, however, found the universal in particular things, which he called the essence of things, while Plato finds that the universal exists apart from particular things, and is related to them as their prototype or exemplar. For Aristotle, therefore, philosophic method implies the ascent from the study of particular phenomena to the knowledge of essences, while for Plato philosophic method means the descent from a knowledge of universal Forms (or ideas) to a contemplation of particular imitations of these. For Aristotle, "form" still refers to the unconditional basis of phenomena but is "instantiated" in a particular substance (see Universals and particulars, below). In a certain sense, Aristotle's method is both inductive and deductive, while Plato's is essentially deductive from a priori principles.
In Aristotle's terminology, "natural philosophy" is a branch of philosophy examining the phenomena of the natural world, and includes fields that would be regarded today as physics, biology and other natural sciences. In modern times, the scope of philosophy has become limited to more generic or abstract inquiries, such as ethics and metaphysics, in which logic plays a major role. Today's philosophy tends to exclude empirical study of the natural world by means of the scientific method. In contrast, Aristotle's philosophical endeavors encompassed virtually all facets of intellectual inquiry.
In the larger sense of the word, Aristotle makes philosophy coextensive with reasoning, which he also would describe as "science". Note, however, that his use of the term science carries a different meaning than that covered by the term "scientific method". For Aristotle, "all science (dianoia) is either practical, poetical or theoretical" (Metaphysics 1025b25). By practical science, he means ethics and politics; by poetical science, he means the study of poetry and the other fine arts; by theoretical science, he means physics, mathematics and metaphysics.
If logic (or "analytics") is regarded as a study preliminary to philosophy, the divisions of Aristotelian philosophy would consist of: Logic;Theoretical Philosophy, including Metaphysics, Physics and Mathematics;  Practical Philosophy and Poetical Philosophy.
In the period between his two stays in Athens, between his times at the Academy and the Lyceum, Aristotle conducted most of the scientific thinking and research for which he is renowned today. In fact, most of Aristotle's life was devoted to the study of the objects of natural science. Aristotle's metaphysics contains observations on the nature of numbers but he made no original contributions to mathematics. He did, however, perform original research in the natural sciences, e.g., botany, zoology, physics, astronomy, chemistry, meteorology, and several other sciences.
Aristotle's writings on science are largely qualitative, as opposed to quantitative. Beginning in the 16th century, scientists began applying mathematics to the physical sciences, and Aristotle's work in this area was deemed hopelessly inadequate. His failings were largely due to the absence of concepts like mass, velocity, force and temperature. He had a conception of speed and temperature, but no quantitative understanding of them, which was partly due to the absence of basic experimental devices, like clocks and thermometers.

Physics

Motion
Main article: potentiality and actuality
Aristotle defined motion as the actuality of a potentiality as such.Aquinas suggested that the passage be understood literally; that motion can indeed be understood as the active fulfillment of a potential, as a transition toward a potentially possible state. Because actuality and potentiality are normally opposites in Aristotle, other commentators either suggest that the wording which has come down to us is erroneous, or that the addition of the "as such" to the definition is critical to understanding it.[
Causality, The Four Causes
Main article: Four causes
Aristotle suggested that the reason for anything coming about can be attributed to four different types of simultaneously active causal factors:
Material cause describes the material out of which something is composed. Thus the material cause of a table is wood, and the material cause of a car is rubber and steel. It is not about action. It does not mean one domino knocks over another domino.
The formal cause is its form, i.e. the arrangement of that matter. It tells us what a thing is, that any thing is determined by the definition, form, pattern, essence, whole, synthesis or archetype. It embraces the account of causes in terms of fundamental principles or general laws, as the whole (i.e., macrostructure) is the cause of its parts, a relationship known as the whole-part causation. Plainly put the formal cause is the idea existing in the first place as exemplar in the mind of the sculptor, and in the second place as intrinsic, determining cause, embodied in the matter. Formal cause could only refer to the essential quality of causation. A more simple example of the formal cause is the blueprint or plan that one has before making or causing a human made object to exist.
The efficient cause is "the primary source", or that from which the change or the ending of the change first starts. It identifies 'what makes of what is made and what causes change of what is changed' and so suggests all sorts of agents, nonliving or living, acting as the sources of change or movement or rest. Representing the current understanding of causality as the relation of cause and effect, this covers the modern definitions of "cause" as either the agent or agency or particular events or states of affairs. More simply again that which immediately sets the thing in motion. So take the two dominos this time of equal weighting, the first is knocked over causing the second also to fall over. This is effectively efficient cause.
The final cause is its purpose, or that for the sake of which a thing exists or is done, including both purposeful and instrumental actions and activities. The final cause or telos is the purpose or end that something is supposed to serve, or it is that from which and that to which the change is. This also covers modern ideas of mental causation involving such psychological causes as volition, need, motivation or motives, rational, irrational, ethical, and all that gives purpose to behavior.
Additionally, things can be causes of one another, causing each other reciprocally, as hard work causes fitness and vice versa, although not in the same way or function, the one is as the beginning of change, the other as the goal. (Thus Aristotle first suggested a reciprocal or circular causality as a relation of mutual dependence or influence of cause upon effect). Moreover, Aristotle indicated that the same thing can be the cause of contrary effects; its presence and absence may result in different outcomes. Simply it is the goal or purpose that brings about an event (not necessarily a mental goal). Taking our two dominos, it requires someone to intentionally knock the dominos over as they cannot fall themselves.
Aristotle marked two modes of causation: proper (prior) causation and accidental (chance) causation. All causes, proper and incidental, can be spoken as potential or as actual, particular or generic. The same language refers to the effects of causes, so that generic effects assigned to generic causes, particular effects to particular causes, operating causes to actual effects. Essentially, causality does not suggest a temporal relation between the cause and the effect.

Metaphysics

Substance, potentiality and actuality

Aristotle examines the concepts of substance and essence (ousia) in his Metaphysics (Book VII), and he concludes that a particular substance is a combination of both matter and form. As he proceeds to the book VIII, he concludes that the matter of the substance is the substratum or the stuff of which it is composed; e.g., the matter of the house are the bricks, stones, timbers etc., or whatever constitutes the potential house, while the form of the substance is the actual house, namely 'covering for bodies and chattels' or any other differentia (see also predicables). The formula that gives the components is the account of the matter, and the formula that gives the differentia is the account of the form.
With regard to the change (kinesis) and its causes now, as he defines in his Physics and On Generation and Corruption 319b-320a, he distinguishes the coming to be from:
growth and diminution, which is change in quantity;
locomotion, which is change in space; and
alteration, which is change in quality.
The coming to be is a change where nothing persists of which the resultant is a property. In that particular change he introduces the concept of potentiality (dynamis) and actuality (entelecheia) in association with the matter and the form.
Referring to potentiality, this is what a thing is capable of doing, or being acted upon, if the conditions are right and it is not prevented by something else. For example, the seed of a plant in the soil is potentially (dynamei) plant, and if is not prevented by something, it will become a plant. Potentially beings can either 'act' (poiein) or 'be acted upon' (paschein), which can be either innate or learned. For example, the eyes possess the potentiality of sight (innate – being acted upon), while the capability of playing the flute can be possessed by learning (exercise – acting).
Actuality is the fulfillment of the end of the potentiality. Because the end (telos) is the principle of every change, and for the sake of the end exists potentiality, therefore actuality is the end. Referring then to our previous example, we could say that an actuality is when a plant does one of the activities that plants do.
"For that for the sake of which a thing is, is its principle, and the becoming is for the sake of the end; and the actuality is the end, and it is for the sake of this that the potentiality is acquired. For animals do not see in order that they may have sight, but they have sight that they may see."
In summary, the matter used to make a house has potentiality to be a house and both the activity of building and the form of the final house are actualities, which is also a final cause or end. Then Aristotle proceeds and concludes that the actuality is prior to potentiality in formula, in time and in substantiality.
With this definition of the particular substance (i.e., matter and form), Aristotle tries to solve the problem of the unity of the beings, for example, "what is it that makes a man one"? Since, according to Plato there are two Ideas: animal and biped, how then is man a unity? However, according to Aristotle, the potential being (matter) and the actual one (form) are one and the same thing

Lady gaga's wikipedia

Lady Gaga...
Stefani Joanne Angelina Germanotta (/ˈstɛfəniː dʒʌrməˈnɑːtə/; born March 28, 1986), better known by her stage name Lady Gaga, is an American singer and songwriter. Born and raised in New York City, she primarily studied at the Convent of the Sacred Heart and briefly attended New York University's Tisch School of the Arts before withdrawing to focus on her musical career. She began performing in the rock music scene of Manhattan's Lower East Side, and by the end of 2007, was signed with Streamline Records. Employed as a songwriter for the record company, her vocal abilities captured the attention of recording artist Akon, who signed her to his label Kon Live Distribution.
Lady Gaga came to prominence as a recording artist following the release of her debut album The Fame (2008), which was a critical and commercial success that topped charts around the world and included the international number-one singles "Just Dance" and "Poker Face". After embarking on the Fame Ball Tour, she followed the album with The Fame Monster (2009), which spawned the worldwide hit singles "Bad Romance", "Telephone" and "Alejandro" and allowed her to embark on the eighteen-month long Monster Ball Tour, which later became one of the highest-grossing concert tours of all time. Her most recent album Born This Way (2011) topped the charts of most major markets and generated more international chart-topping singles that include "Born This Way", "Judas" and "The Edge of Glory". Beside her musical career, she involves herself with humanitarian causes and LGBT activism.
Influenced by such acts as David Bowie, Michael Jackson, Madonna and Queen, Lady Gaga is well recognized for her flamboyant, diverse and outré contributions to the music industry through fashion, performance and music videos. She has sold an estimated 23 million albums and 64 million singles worldwide, making her one of the best-selling music artists of all time and her singles some of the best-selling worldwide. Her achievements include four Guinness World Records, five Grammy Awards and thirteen MTV Video Music Awards. Lady Gaga has consecutively appeared on Billboard magazine's Artists of the Year (scoring the definitive title in 2010), is regularly placed on lists composed by Forbes magazine, and was named one of the most influential people in the world by Time magazine.

Biography

1986–2004: Early life
Lady Gaga was born Stefani Joanne Angelina Germanotta on March 28, 1986, in New York City.[5] Brought up in the family home in Manhattan's Upper West Side, Lady Gaga is of Italianand more distant French-Canadian descent, and is the daughter of Cynthia (née Bissett) and Joseph Germanotta, an internet entrepreneur. The elder of two children, Lady Gaga has one sister, Natali, a fashion student, who was born in 1992.Lady Gaga has stressed that – despite her seemingly affluent upbringing – she did not come from a wealthy background, stating that her parents "both came from lower-class families, so we've worked for everything—my mother worked eight to eight out of the house, in telecommunications, and so did my father."
From the age of 11, Lady Gaga – who was raised Roman Catholic – attended the Convent of the Sacred Heart, a private all-girls Roman Catholic school on Manhattan's Upper East Side.She described her academic life in high school as "very dedicated, very studious, very disciplined" but also "a bit insecure" as she told in an interview, "I used to get made fun of for being either too provocative or too eccentric, so I started to tone it down. I didn't fit in, and I felt like a freak." Acquaintances dispute that she did not fit in at school. "She had a core group of friends; she was a good student. She liked boys a lot, but singing was No. 1," recalled a former high school classmate.
Being part of such a prestigious performance course, she sharpened her songwriting skills while composing essays and analytical papers on art, religion, social issues and politics including a thesis on pop artists Spencer Tunick and Damien Hirst; such research prepared her for her future career focus in "music, art, sex and celebrity." She also tried out for and won auditions while at CAP21, including the part of an unsuspecting diner customer where MTV's Boiling Points – a prank reality television show – was being filmed.Notwithstanding these achievements, she felt that she was more creative than some of her classmates."Once you learn how to think about art, you can teach yourself," she said. By the second semester of her sophomore year, she withdrew from the school to focus on her musical career.Her father agreed to pay her rent for a year, on the condition that she re-enroll at Tisch if unsuccessful. "I left my entire family, got the cheapest apartment I could find, and ate shit until somebody would listen," she remembers.

2005–07: Career beginnings
Settled in a small apartment on Rivington Street towards the summer of 2005,Lady Gaga recorded a couple of songs with hip-hop singer Grandmaster Melle Mel, for an audio book accompanying the children's book The Portal in the Park, by Cricket Casey. She also began a band called the Stefani Germanotta Band (SGBand) with some friends from NYU – guitarist Calvin Pia, bassist Eli Silverman, drummer Alex Beckham and booking manager Frank Fredericks[28] – in September of that year.The band played a mixture of songs: some self-penned alongside classic rock numbers like Led Zeppelin's "D'yer Mak'er". Playing in bars like the Greenwich Village's The Bitter End and the Lower East Side's the Mercury Lounge, the band developed a small fan base and caught the eye of music producer Joe Vulpis. Soon after arranging time in Vulpis' studio in the months that followed, SGBand were selling their extended plays Words and Red and Blue at gigs around New York while becoming a local fixture of the downtown Lower East Side club scene.
Although the musical relationship between Fusari and Lady Gaga was unsuccessful at first, the pair soon set up a company titled Team Lovechild in which they recorded and produced electropop tracks and sent them to music industry bosses. Joshua Sarubin, the head of A&R at Def Jam Recordings, responded positively and vied for the record company to take a chance on her "unusual and provocative" performance. After having his boss Antonio "L.A." Reid in agreement, Lady Gaga was signed to Def Jam in September 2006 with the intention of having an album ready in nine months. However, she was dropped by the label after only three months – an unfortunate period of her life that would later inspire her treatment for the music video for her 2011 single "Marry the Night".Devastated, Lady Gaga returned to the solace of the family home for Christmas and the nightlife culture of the Lower East Side. She became increasingly experimental: fascinating herself with emerging neo-burlesque shows, go-go dancing at bars dressed in little more than a bikiniin addition to experimenting with drugs. Her father, however, did not understand the reason behind her drug intake and could not look at her for several months."I was onstage in a thong, with a fringe hanging over my ass thinking that had covered it, lighting hairsprays on fire, go-go dancing to Black Sabbath and singing songs about oral sex. The kids would scream and cheer and then we'd all go grab a beer. It represented freedom to me. I went to a Catholic school but it was on the New York underground that I found myself." It was then when she became romantically involved with a heavy metal drummer in a relationship and break-up she likened to the musical film Grease: "I was his Sandy, and he was my Danny, and I just broke." He later became an inspiration behind some of her later songs.[

2008–10: The Fame and The Fame Monster


Lady Gaga performing at The Fame Ball Tour in 2009
By 2008, Lady Gaga had relocated to Los Angeles, where she worked extensively with her record label to complete her debut albumin addition to setting up her own creative team – modeled on Andy Warhol's Factory – Haus of Gaga. Intensive work continued on the album, combining genres "from Def Leppard drums and hand claps to metal drums on urban tracks" while drawing inspiration from 1980s synthpop and incorporating dance music with clear hooks. The Fame, described as an exploration of her obsession with fame and the intricacies of a rich and famous lifestyle, was first released on August 19, 2008, preceded by lead single "Just Dance" four months earlier. Due to radio play being slow, Lady Gaga supported the releases by performing in the backwaters of Malta and Vietnam in addition to small gay clubs around the United States.She was also billed as a supporting artist on the North American leg of New Kids on the Block's reunion concert tour.
A sleeper hit, "Just Dance" hit the summit of the charts in six countries – Australia, Canada, the Netherlands, Ireland, the United Kingdom, and the United States – in January 2009. The Grammy Award-nominated songprovoked the instant success of The Fame. Receiving positive reviews from contemporary critics who commended Lady Gaga's ability to discover a melodious hook and compared her vocal abilities to those of Gwen Stefani, the album went to number-one in countries like the United Kingdom, Canada, Austria, Germany, Switzerland and Ireland while appearing in the top-five in Australia, the United States and fifteen other countries.On Billboard's Dance/Electronic Albums chart, it stayed at the top spot 106 non-consecutive weeks. Since its release, The Fame has sold over 12 million copies worldwide. Lady Gaga achieved an even greater unexpected success when "Poker Face", another sleeper hit, reachedumber-one in almost all major music markets in the world including the United Kingdom and the United States in early 2009.The follow-up single won the award for Best Dance Recording at the 52nd Grammy Awards over nominations for Song of the Year and Record of the Year, while The Fame was nominated for Album of the Year and won the Grammy Award for Best Dance/Electronica Album. Lady Gaga was the recipient of many other honors in 2009 including the accumulation of 3 of 9 MTV Video Music Awards nominations – she won Best New Artist while the video for her single "Paparazzi" gained the awards for Best Art Direction and Best Special Effects– and Billboard magazine's Rising Star award. In addition to being an opening act on the Pussycat Dolls' Doll Domination Tour during the first half of 2009 on their legs in Europe and Oceania, she also embarked on her own six-month critically appreciated worldwide concert tour The Fame Ball Tour which ran from March to September 2009

2011–present: Born This Way
Lady Gaga's second studio album and third major release Born This Way was released on May 23, 2011. Described as "a marriage of electronic music with major [...] metal or rock 'n' roll, pop, anthemic style melodies with really sledge-hammering dance beats" and referred to as an album "about what what keeps us up at night and what makes us afraid", she stated. Lady Gaga characterized her new music as "something so much deeper than a wig or lipstick or a fucking meat dress" and upon hearing it, Akon remarked that she is taking music to the "next level".Its arrival followed the release of its eponymous lead single "Born This Way" on February 11, 2011,which was performed live for the first time at the 53rd Grammy Awards two days after its release. The song, dealing with self-acceptance regardless of race or sexual orientation, debuted atop the Billboard Hot 100, becoming the 19th number-one debut and the 1,000th number-one single in the history of the charts, while selling more than 3 million digital copies in the United States by October 2011, becoming her eighth consecutive single to exceed the sales of two million. A music video was released for the song, showing Lady Gaga giving birth to a new race amidst surrealistic images; critics noted artistic and cultural references and praised its concept. Lady Gaga lent her vocals elsewhere, pairing with Elton John to record an original duet for the animated feature film Gnomeo & Juliet. The song, titled "Hello, Hello", was released on February 11, 2011, without Lady Gaga's vocals. The duet version was only featured in the film.In February, Lady Gaga's concerts of her then-ongoing tour at Madison Square Garden in New York City, were filmed for an HBO special aired in May. The special was nominated for five Emmy Awards.
Two other singles, "Judas" and "The Edge of Glory",as well as a promotional single, "Hair", were eventually released before the album. The music video for "Judas", in which Gaga portrays Mary Magdalene, and Biblical figures such as Jesus Christ and Judas Iscariot are also featured, was criticized for its religious references; the video, nonetheless, received acclaim for its overall delivery and praise from others who claimed that there was nothing offensive about it. "Judas" additionally peaked within the top ten in several major musical markets. "The Edge of Glory" was intended as a promotional single; nevertheless, due to commercial success in digital outlets,the song was released as a single to critical appreciation, accompanied by a music video. Gaga also undertook a job as a fashion columnist for V, where she wrote about her creative process, her studying of the world of pop culture, and her ability to tune into the evolution of pop-culture meme.Upon release, Born This Way sold 1.108 million copies in its first week in the United States, debuting atop the Billboard 200, and topping the charts in more than 20 other countries. The album received generally positive reviews from music critics, who praised its range of different styles as well as her vocals.Later, Lady Gaga went to Sydney to promote Born This Way with a one-of-a-kind concert at the Sydney Town Hall on July 13, 2011


Musical and performance style
Lady Gaga's musical and performance style has been the subject of much analysis and scrutiny of critics. She professes that she is "liberating" herself by constantly reinventing her image and sound, insisting that it is a practice she has been drawn to since her childhood. Her career has been a continuous experimentation with new musical ideas and images in constant quest for new heights of fame and acclaim.
Vocally, Lady Gaga has drawn frequent comparison to the ranges of Madonna and Gwen Stefani. Possessing the range of a contralto, Lady Gaga exhibits "overwhelming expression, instinctive vocal phrasing, '80s rock reminiscent chest belts and animalistic vocal ticks" while being able to move through 2.4 octaves. Lady Gaga, who refuses to lip sync,has manipulated her vocal style over the course of her career yet considers Born This Way (2011) "much more vocally up to par with what I've always been capable of."In summation of her voice, Entertainment Weekly wrote, "There's an immense emotional intelligence behind the way she uses her voice. Almost never does she overwhelm a song with her vocal ability, recognizing instead that artistry is to be found in nuance rather than lung power."
Although her early lyrics have been criticized for lacking intellectual stimulation, "[Gaga] does manage to get you moving and grooving at an almost effortless pace." She admits that her songwriting has been misinterpreted; her friend and blogger Perez Hilton articulated her message in a clearer way: "you write really deep intelligent lyrics with shallow concepts." Lady Gaga opined, "Perez is very intelligent and clearly listened to my record from beginning to end, and he is correct. "I love songwriting. It's so funny – I will just jam around in my underwear or I could be washing my dishes. I wrote several songs just at the piano," she confesses.[149] Gaga believes that "all good music can be played at a piano and still sound like a hit."[150] She has covered a wide variety of topics in her songs: while The Fame (2008) meditates on the lust for stardom, The Fame Monster (2009) expresses fame's dark side through monster metaphors. Born This Way (2011) is sung in English, French, German and Spanish and includes common themes in Lady Gaga's controversial songwriting like love, sex, religion, money, drugs, identity, liberation, sexuality, freedom and individualism.
Her performances are described as "highly entertaining and innovative"; the blood-spurting performance of "Paparazzi" at the 2009 MTV Video Music Awards was described as "eye-popping" by MTV. She continued the "blood soaked" theme in The Monster Ball Tour, in which she wore a revealing leather corset and is "attacked" by a performer dressed in black who gnaws on her throat, causing "blood" to spurt down her chest, after which she lies "dying" in a pool of blood. Her performances of that scene on tour in England triggered protests from family groups and fans in the aftermath of a local tragedy, in which a taxi driver had murdered 12 people. "What happened in Bradford is very fresh in people's minds and given all the violence which happened in Cumbria just hours earlier, it was insensitive," said Lynn Costello of Mothers Against Violence. Her unconventionality continued at the 2011 MTV Video Music Awards when she performed in drag as her male alter ego, Jo Calderone, and delivered a lovesick monologue before a performance of her song "Yoü and I". Chris Rock has defended her flamboyant and provocative behavior. "Well, she's Lady Gaga," he said. "She's not 'Lady Behave Yourself.' Do you want great behavior from a person named Gaga? Is this what you were expecting?

Philanthropy

Besides her career in music, Lady Gaga has also contributed to various charities and humanitarian works. In 2011, she launched her own non-profit organization, the Born This Way Foundation, which focuses on youth empowerment and issues like self-confidence, well-being, anti-bullying, mentoring, and career development. "My mother and I have initiated a passion project. We call it the Born This Way Foundation," Gaga said in a statement about the foundation, which takes its name from the eponymous 2011 single and album. "Together we hope to establish a standard of Bravery and Kindness, as well as a community worldwide that protects and nurtures others in the face of bullying and abandonment." The foundation will work with a number of partners, including the John D. and Catherine T. MacArthur Foundation, The California Endowment and the Berkman Center for Internet & Society at Harvard University.

For natural disasters, Gaga has also helped various relief efforts. Although declining an invitation to appear on the single "We Are the World 25" to benefit victims of the 2010 Haiti earthquake, she donated the proceeds of her January 24, 2010 concert at New York's Radio City Music Hall to the country's reconstruction relief fund. All profits from her official online store on that day were also donated. Lady Gaga announced that an estimated total of $500,000 was collected for the fund. Hours after the 2011 Tōhoku earthquake and tsunami hit Japan on March 11, 2011, Gaga tweeted a message and a link to Japan Prayer Bracelets. All revenue from a bracelet she designed in conjunction with the company was donated to relief efforts. As of March 29, 2011, the bracelets raised $1.5 million.However, attorney Alyson Oliver filed a lawsuit against Lady Gaga in Detroit in June 2011, noting that the bracelet was subject to a sales tax and an extra $3.99 shipping charge was added to the price. She also believed that not all proceeds from the bracelets would go to the relief efforts, demanding a public accounting of the campaign and refunds for people who had bought the bracelet. Lady Gaga's spokesperson called the lawsuit "meritless" and "misleading".On June 25, 2011 Lady Gaga performed at MTV Japan's charity show in Makuhari Messe, which benefited the Japanese Red Cross

Off-court activities of serena williams...........

Serena Williams
Serena Jameka Williams (born September 26, 1981) is an American professional tennis player and a former world no. 1. The Women's Tennis Association has ranked her world no. 1 in singles on five separate occasions. She became the world no. 1 for the first time on July 8, 2002 and regained this ranking for the fifth time on November 2, 2009. She is considered to be one of the greatest women's tennis players of all time.
Her 27 Grand Slam titles places her ninth on the all-time list: 13 in singles, 12 in women's doubles, and 2 in mixed doubles. She is the most recent player, male or female, to have held all four Grand Slam singles titles simultaneously and only the fifth woman in history to do so. She was also the first woman, along with sister Venus Williams, to hold all four Grand Slam doubles titles simultaneously since Martina Hingis did so in 1998. Her 13 Grand Slam singles titles is sixth on the all-time list.Williams ranks fourth in Grand Slam women's singles titles won during the open era, behind Steffi Graf (22 titles) and Chris Evert and Martina Navratilova (18 titles each). She has won more Major titles in singles, doubles, and mixed doubles than any other active player, male or female.

 life
Serena Williams was born in Saginaw, Michigan, to Richard Williams and Oracene Price. She is of African American heritage and is the youngest of Price's five daughters: half-sisters Yetunde (1972–2003), Lyndrea and Isha Price, and full sister Venus. When the children were young, the family moved to the city of Compton in Los Angeles county, where Serena started playing tennis at the age of five. Her father home-schooled Serena and her sister Venus and to this day, Serena Williams was and remains coached by both her parents.
Williams' family moved from Compton to Haines City when she was nine so that she could attend the tennis academy of Rick Macci, who would provide additional coaching. Macci spotted the exceptional talents of the sisters. He did not always agree with Williams' father but respected that "he treated his daughters like kids, allowed them to be little girls". Richard stopped sending his daughters to national junior tennis tournaments when Williams was 10, since he wanted them to take it slow and focus on school work. Another motivation was racial, as he had allegedly heard parents of white players talk about the Williams sisters in a derogatory manner during tournaments.At that time, Williams had a 46–3 record on the United States Tennis Association junior tour and was ranked No. 1 among under 10 players in Florida. In 1995, when Serena was in the ninth grade, Richard pulled his daughters out of Macci's academy, and from then on took over all coaching at their home. When asked in 2000 whether having followed the normal path of playing regularly on the junior circuit would have been beneficial, Williams responded: "Everyone does different things. I think for Venus and I, we just tried a different road, and it worked for us.

Playing style

Williams is primarily a baseline player. Her game is built around taking immediate control of rallies with a powerful and consistent serve (considered by some to be the best in the women's game), return of serve, and forceful groundstrokes from both her forehand and backhand swings. Williams' forehand is considered to be among the most powerful shots in the women's game as is her double-handed backhand. Williams strikes her backhand groundstroke using an open stance, and uses the same open stance for her forehand. Williams's aggressive play, a "high risk" style, is balanced in part by her serve, which combines great power and placement with very high consistency.Her serve has been hit as hard as 128 mph (206.5 km/h), the second-fastest all-time among female players (Venus recorded the fastest with 129 mph)..[citation needed] Serena also possesses a very solid volley and powerful overhead which is very useful for her net game. Although many think of Williams as only an offensive player, she also plays a strong defensive game.

Off-court activities

Entertainment
Williams has appeared on television and also provided voice work on animated shows: in a 2001 episode of The Simpsons Serena joined the animation along with sister Venus, Pete Sampras and Andre Agassi.[92] She has also provided guest voice work in a 2005 episode of Playhouse Disney's animated kids show Higglytown Heroes and a 2007 episode of the Nickelodeon cartoon Avatar: The Last Airbender,which she has described as her "favorite show".
Williams has posed for the 2003 and 2004 editions of the Sports Illustrated Swimsuit Issue. In April 2005, MTV announced plans to broadcast a reality show around the lives of Serena and Venus, which was eventually aired on ABC Family. Williams has appeared twice on MTV's Punk'd and in 2007, appeared in the ABC reality television series Fast Cars and Superstars: The Gillette Young Guns Celebrity Race. In 2002, she played Miss Wiggins in the season 3 episode "Crouching Mother, Hidden Father" of My Wife and Kids;she has also guest-starred during episodes of ER and Law & Order: Special Victims Unit. In 2007 Williams appeared in the music video of "I Want You" by the American rapper Common, alongside performers Alicia Keys and Kanye West.

Fashion
Williams was once known for her unusual and colorful outfits on court. In 2002, there was much talk when she wore a black lycra catsuit at the US Open. At the 2004 US Open, Williams wore denim skirts and knee-high boots—tournament officials, however, did not allow her to wear the boots during matches.At Wimbledon in 2008, the white trench coat she wore during warm-up for her opening match was the subject of much discussion since it was worn despite the sunny weather.Off-court, Williams has also presented new designs. In November 2004, at the London premiere of After the Sunset she wore a red gown that had a near-topless effect.
Williams formerly had a special line with Puma and currently has a line with Nike. The deal with Nike is worth US$40 million and was signed in April 2004. Since 2004, she has also been running her own line of designer apparel called "Aneres"—her first name spelled backward. In 2009 she launched a signature collection of handbags and jewelry.The collection, called Signature Statement, is sold mainly on the Home Shopping Network (HSN).
In early 2010, Williams became a certified nail technician in preparation for her upcoming nail collection with a company called HairTech.

Writing
Serena has published along with her sister Venus Williams and renowned author Hilary Beard a book titled Venus & Serena: Serving From The Hip: 10 Rules For Living, Loving and Winning by Boston: Houghton Mifflin in 2005.During the 2009 Wimbledon Championships, Williams said that she is in the process of writing a TV show storyline, which will be converted into script form by her agency. She stated that the show will represent subject matter from a mix of popular American television shows such as Desperate Housewives, Sex and the City, and Family Guy.Serena released her first solo published work, an autobiography entitled On the Line, following the 2009 US Open.

Charity work
In 2008 Williams helped to fund the construction of the Serena Williams Secondary School in Matooni, Kenya.She received a Celebrity Role Model Award from Avon Foundation in 2003 for work in breast cancer. Williams has also been involved in a number of clinics at schools and community centers, particularly those which have programs focusing on at-risk youth.She has also won the "Young Heroes Award" from Big Brothers Big Sisters of Greater L.A. and Inland (2003) and the "Family Circle and Prudential Financial Player Who Makes a Difference Award" (2004).[1] In response to the 2010 Haiti earthquake, Williams, along with other ATP and WTA stars decided to forego their final day of preparation for the 2010 Australian Open to form a charity event in which all proceeds will go to the Haiti earthquake victims.

Miami Dolphins venture

In August 2009, Serena and Venus Williams became part-owners of the Miami Dolphins. The formal announcement was made during a press conference overlooking the practice field. The Williams are the first African-American females to obtain ownership in an NFL franchise. Other prominent owners include: Jimmy Buffett, Gloria and Emilio Estefan (the first Cuban-American owners), and Marc Anthony and Jennifer Lopez . Stephan Ross, the majority owner of the Dolphins, said "We are thrilled to have Venus and Serena join the Dolphins as limited partners. They are among the most admired athletes in the world and have become global ambassadors for the game of tennis. Their addition to our ownership group further reflects our commitment to connect with aggressively and embrace the great diversity that makes South Florida a multicultural gem.

Security.
Williams has been the target of an alleged stalker, who was arrested at the gate to her Palm Beach Gardens, Fla., neighborhood on Monday, May 2, 2011. Police report that Patenema Ouedraogo, identified as an African who attended college in Texas, is barred from being near Serena by a preliminary injunction. Police say Ouedraogo was able to track Serena's whereabouts using the social networking site Twitter, and got her address from the letter her attorney sent telling him to stay away from her. Police say Ouedraogo once made it all the way to Serena's dressing room when she made an appearance on the Home Shopping Network at their studios in Tampa, Fla., on April 13, 2011.

Encyclopedia of Obama..

Barack Obama

Barack Hussein Obama II ( born August 4, 1961) is the 44th and current President of the United States. He is the first African American to hold the office. Obama previously served as a United States Senator from Illinois, from January 2005 until he resigned following his victory in the 2008 presidential election.
Born in Honolulu, Hawaii, Obama is a graduate of Columbia University and Harvard Law School, where he was the president of the Harvard Law Review. He was a community organizer in Chicago before earning his law degree. He worked as a civil rights attorney in Chicago and taught constitutional law at the University of Chicago Law School from 1992 to 2004. He served three terms representing the 13th District in the Illinois Senate from 1997 to 2004.
Following an unsuccessful bid against the Democratic incumbent for a seat in the United States House of Representatives in 2000, Obama ran for the United States Senate in 2004. Several events brought him to national attention during the campaign, including his victory in the March 2004 Illinois Democratic primary for the Senate election and his keynote address at the Democratic National Convention in July 2004. He won election to the U.S. Senate in Illinois in November 2004. His presidential campaign began in February 2007, and after a close campaign in the 2008 Democratic Party presidential primaries against Hillary Rodham Clinton, he won his party's nomination. In the 2008 presidential election, he defeated Republican nominee John McCain, and was inaugurated as president on January 20, 2009. In October 2009, Obama was named the 2009 Nobel Peace Prize laureate

Early life and career

Obama was born on August 4, 1961, at Kapiʻolani Maternity & Gynecological Hospital (now called Kapiʻolani Medical Center for Women and Children) in Honolulu, Hawaii, and is the first President to have been born in Hawaii. His mother, Stanley Ann Dunham, was born in Wichita, Kansas and was of English and Irish descent. His father, Barack Obama, Sr., was a Luo from Nyang'oma Kogelo, Nyanza Province, Kenya. Obama's parents met in 1960 in a Russian language class at the University of Hawaiʻi at Mānoa, where his father was a foreign student on scholarship.The couple married on February 2, 1961,separated when Obama Sr. went to Harvard University on scholarship, and divorced in 1964. Obama Sr. remarried and returned to Kenya, visiting Barack in Hawaii only once, in 1971. He died in an automobile accident in 1982.
After her divorce, Dunham married Indonesian student Lolo Soetoro, who was attending college in Hawaii. When Suharto, a military leader in Soetoro's home country, came to power in 1967, all Indonesian students studying abroad were recalled, and the family moved to the Menteng neighborhood of Jakarta. From ages six to ten, Obama attended local schools in Jakarta, including Besuki Public School and St. Francis of Assisi School. Because of his childhood background, today Obama is quite popular in Indonesia.
In 1971, Obama returned to Honolulu to live with his maternal grandparents, Madelyn and Stanley Armour Dunham, and with the aid of a scholarship he attended Punahou School, a private college preparatory school, from the fifth grade until his graduation from high school in 1979. Obama's mother returned to Hawaii in 1972, remaining there until 1977 when she went back to Indonesia to work as an anthropological field worker. She finally returned to Hawaii in 1994 and lived there for one year, before dying of ovarian cancer
Following high school, Obama moved to Los Angeles in 1979 to attend Occidental College. In February 1981, he made his first public speech, calling for Occidental's disinvestment from South Africa due to its policy of apartheid. In mid-1981, Obama traveled to Indonesia to visit his mother and sister Maya, and visited the families of college friends in Pakistan and India for three weeks.
Later in 1981, he transferred to Columbia University in New York City, where he majored in political science with a specialty in international relations and graduated with a Bachelor of Arts in 1983. He worked for a year at the Business International Corporation,then at the New York Public Interest Research Group.



University of Chicago Law School and civil rights attorney
In 1991, Obama accepted a two-year position as Visiting Law and Government Fellow at the University of Chicago Law School to work on his first book. He then served as a professor at the University of Chicago Law School for twelve years—as a Lecturer from 1992 to 1996, and as a Senior Lecturer from 1996 to 2004—teaching constitutional law.
From April to October 1992, Obama directed Illinois's Project Vote, a voter registration drive with ten staffers and seven hundred volunteer registrars; it achieved its goal of registering 150,000 of 400,000 unregistered African Americans in the state, and led to Crain's Chicago Business naming Obama to its 1993 list of "40 under Forty" powers to be. In 1993 he joined Davis, Miner, Barnhill & Galland, a 13-attorney law firm specializing in civil rights litigation and neighborhood economic development, where he was an associate for three years from 1993 to 1996, then of counsel from 1996 to 2004, with his law license becoming inactive in 2002.
From 1994 to 2002, Obama served on the boards of directors of the Woods Fund of Chicago, which in 1985 had been the first foundation to fund the Developing Communities Project; and of the Joyce Foundation. He served on the board of directors of the Chicago Annenberg Challenge from 1995 to 2002, as founding president and chairman of the board of directors from 1995 to 1999.

Legislative career: 1997–2008

State Senator: 1997–2004
Obama was elected to the Illinois Senate in 1996, succeeding State Senator Alice Palmer as Senator from Illinois's 13th District, which at that time spanned Chicago South Side neighborhoods from Hyde Park – Kenwood south to South Shore and west to Chicago Lawn. Once elected, Obama gained bipartisan support for legislation reforming ethics and health care laws. He sponsored a law increasing tax credits for low-income workers, negotiated welfare reform, and promoted increased subsidies for childcare.In 2001, as co-chairman of the bipartisan Joint Committee on Administrative Rules, Obama supported Republican Governor Ryan's payday loan regulations and predatory mortgage lending regulations aimed at averting home foreclosures.
Obama was reelected to the Illinois Senate in 1998, defeating Republican Yesse Yehudah in the general election, and was reelected again in 2002. In 2000, he lost a Democratic primary run for the U.S. House of Representatives to four-term incumbent Bobby Rush by a margin of two to one.

U.S. Senate campaign
In May 2002, Obama commissioned a poll to assess his prospects in a 2004 U.S. Senate race; he created a campaign committee, began raising funds and lined up political media consultant David Axelrod by August 2002, and formally announced his candidacy in January 2003.
Obama was an early opponent of the George W. Bush administration's 2003 invasion of Iraq. On October 2, 2002, the day President Bush and Congress agreed on the joint resolution authorizing the Iraq War,Obama addressed the first high-profile Chicago anti-Iraq War rally, and spoke out against the war. He addressed another anti-war rally in March 2003 and told the crowd that "it's not too late" to stop the war.


County results of the 2004 US Senate race in Illinois. Counties in blue were won by Obama.
Decisions by Republican incumbent Peter Fitzgerald and his Democratic predecessor Carol Moseley Braun to not participate in the election resulted in wide-open Democratic and Republican primary contests involving fifteen candidates. In the March 2004 primary election, Obama won in an unexpected landslide—which overnight made him a rising star within the national Democratic Party, started speculation about a presidential future, and led to the reissue of his memoir, Dreams from My Father.

U.S. Senator: 2005–2008
Obama was sworn in as a senator on January 3, 2005, becoming the only Senate member of the Congressional Black Caucus. CQ Weekly characterized him as a "loyal Democrat" based on analysis of all Senate votes in 2005–2007. Obama announced on November 13, 2008, that he would resign his Senate seat on November 16, 2008, before the start of the lame-duck session, to focus on his transition period for the presidency.

Legislation
bama cosponsored the Secure America and Orderly Immigration Act. He introduced two initiatives bearing his name: Lugar–Obama, which expanded the Nunn–Lugar cooperative threat reduction concept to conventional weapons; and the Federal Funding Accountability and Transparency Act of 2006, which authorized the establishment of USAspending.gov, a web search engine on federal spending. On June 3, 2008, Senator Obama—along with Senators Tom Carper, Tom Coburn, and John McCain—introduced follow-up legislation: Strengthening Transparency and Accountability in Federal Spending Act of 2008.
Obama sponsored legislation that would have required nuclear plant owners to notify state and local authorities of radioactive leaks, but the bill failed to pass in the full Senate after being heavily modified in committee. Regarding tort reform, Obama voted for the Class Action Fairness Act of 2005 and the FISA Amendments Act of 2008, which grants immunity from civil liability to telecommunications companies complicit with NSA warrantless wiretapping operations

Committees
Obama held assignments on the Senate Committees for Foreign Relations, Environment and Public Works and Veterans' Affairs through December 2006. In January 2007, he left the Environment and Public Works committee and took additional assignments with Health, Education, Labor and Pensions and Homeland Security and Governmental Affairs.He also became Chairman of the Senate's subcommittee on European Affairs. As a member of the Senate Foreign Relations Committee, Obama made official trips to Eastern Europe, the Middle East, Central Asia and Africa. He met with Mahmoud Abbas before Abbas became President of the Palestinian Authority, and gave a speech at the University of Nairobi condemning corruption within the Kenyan government.

Domestic policy
The first bill signed into law by Obama was the Lilly Ledbetter Fair Pay Act of 2009, relaxing the statute of limitations for equal-pay lawsuits. Five days later, he signed the reauthorization of the State Children's Health Insurance Program (SCHIP) to cover an additional 4 million children currently uninsured.
In March 2009, Obama reversed a Bush-era policy which had limited funding of embryonic stem cell research. Obama stated that he believed "sound science and moral values ... are not inconsistent" and pledged to develop "strict guidelines" on the research.
Obama appointed two women to serve on the Supreme Court in the first two years of his Presidency. Sonia Sotomayor, nominated by Obama on May 26, 2009, to replace retiring Associate Justice David Souter, was confirmed on August 6, 2009, becoming the first Hispanic to be a Supreme Court Justice. Elena Kagan, nominated by Obama on May 10, 2010, to replace retiring Associate Justice John Paul Stevens, was confirmed on August 5, 2010, bringing the number of women sitting simultaneously on the Court to three, for the first time in American history.

Economic policy
On February 17, 2009, Obama signed the American Recovery and Reinvestment Act of 2009, a $787 billion economic stimulus package aimed at helping the economy recover from the deepening worldwide recession.[139] The act includes increased federal spending for health care, infrastructure, education, various tax breaks and incentives, and direct assistance to individuals, which is being distributed over the course of several years.
In March, Obama's Treasury Secretary, Timothy Geithner, took further steps to manage the financial crisis, including introducing the Public-Private Investment Program for Legacy Assets, which contains provisions for buying up to $2 trillion in depreciated real estate assets.
Obama intervened in the troubled automotive industry in March 2009, renewing loans for General Motors and Chrysler to continue operations while reorganizing. Over the following months the White House set terms for both firms' bankruptcies, including the sale of Chrysler to Italian automaker Fiat[143] and a reorganization of GM giving the U.S. government a temporary 60% equity stake in the company, with the Canadian government shouldering a 12% stake. In June 2009, dissatisfied with the pace of economic stimulus, Obama called on his cabinet to accelerate the investment.He signed into law the Car Allowance Rebate System, known colloquially as "Cash for Clunkers", that temporarily boosted the economy.
The unemployment rate rose in 2009, reaching a peak in October at 10.1% and averaging 10.0% in the fourth quarter.[156] Following a decrease to 9.7% in the first quarter of 2010, the unemployment rate fell to 9.6% in the second quarter, where it remained for the rest of the year. Between February and December 2010, employment rose by 0.8%, which was less than the average of 1.9% experienced during comparable periods in the past four employment recoveries. GDP growth returned in the third quarter of 2009, expanding at a 1.6% pace, followed by a 5.0% increase in the fourth quarter. Growth continued in 2010, posting an increase of 3.7% in the first quarter, with lesser gains throughout the rest of the year. In July 2010, the Federal Reserve expressed that although economic activity continued to increase, its pace had slowed and its Chairman, Ben Bernanke, stated that the economic outlook was "unusually uncertain." Overall, the economy expanded at a rate of 2.9% in 2010

Gulf of Mexico oil spill
On April 20, 2010, an explosion destroyed an offshore drilling rig at the Macondo Prospect in the Gulf of Mexico, causing a major sustained oil leak. The well's operator, BP, initiated a containment and cleanup plan, and began drilling two relief wells intended to stop the flow. Obama visited the Gulf on May 2 among visits by members of his cabinet, and again on May 28 and June 4. He began[when?] a federal investigation and formed a bipartisan commission to recommend new safety standards, after a review by Secretary of the Interior Ken Salazar and concurrent Congressional hearings. On May 27, he announced a 6-month moratorium on new deepwater drilling permits and leases, pending regulatory review.[180] As multiple efforts by BP failed, some in the media and public expressed confusion and criticism over various aspects of the incident, and stated a desire for more involvement by Obama and the federal government.

Health care reform
Obama called for Congress to pass legislation reforming health care in the United States, a key campaign promise and a top legislative goal. He proposed an expansion of health insurance coverage to cover the uninsured, to cap premium increases, and to allow people to retain their coverage when they leave or change jobs. His proposal was to spend $900 billion over 10 years and include a government insurance plan, also known as the public option, to compete with the corporate insurance sector as a main component to lowering costs and improving quality of health care. It would also make it illegal for insurers to drop sick people or deny them coverage for pre-existing conditions, and require every American carry health coverage. The plan also includes medical spending cuts and taxes on insurance companies that offer expensive plans.
On July 14, 2009, House Democratic leaders introduced a 1,017-page plan for overhauling the U.S. health care system, which Obama wanted Congress to approve by the end of 2009. After much public debate during the Congressional summer recess of 2009, Obama delivered a speech to a joint session of Congress on September 9 where he addressed concerns over his administration's proposals.In March 2009, Obama lifted a ban on stem cell research.

Foreign policy
In February and March, Vice President Joe Biden and Secretary of State Hillary Rodham Clinton made separate overseas trips to announce a "new era" in U.S. foreign relations with Russia and Europe, using the terms "break" and "reset" to signal major changes from the policies of the preceding administration.Obama attempted to reach out to Arab leaders by granting his first interview to an Arab cable TV network, Al Arabiya.
On March 19, Obama continued his outreach to the Muslim world, releasing a New Year's video message to the people and government of Iran.This attempt at outreach was rebuffed by the Iranian leadership.In April, Obama gave a speech in Ankara, Turkey, which was well received by many Arab governments.On June 4, 2009, Obama delivered a speech at Cairo University in Egypt calling for "a new beginning" in relations between the Islamic world and the United States and promoting Middle East peace.
On June 26, 2009, in response to the Iranian government's actions towards protesters following Iran's 2009 presidential election, Obama said: "The violence perpetrated against them is outrageous. We see it and we condemn it."[188] On July 7, while in Moscow, he responded to a Vice President Biden comment on a possible Israeli military strike on Iran by saying: "We have said directly to the Israelis that it is important to try and resolve this in an international setting in a way that does not create major conflict in the Middle East.


British Prime Minister David Cameron and President Barack Obama, during the 2010 G-20 Toronto summit.
On September 24, 2009, Obama became the first sitting U.S. president to preside over a meeting of the United Nations Security Council.
In March 2010, Obama took a public stance against plans by the government of Israeli Prime Minister Benjamin Netanyahu to continue building Jewish housing projects in predominantly Arab neighborhoods of East Jerusalem. During the same month, an agreement was reached with the administration of Russian President Dmitry Medvedev to replace the 1991 Strategic Arms Reduction Treaty with a new pact reducing the number of long-range nuclear weapons in the arsenals of both countries by about one-third. The New START treaty was signed by Obama and Medvedev in April 2010, and was ratified by the U.S. Senate in December

War

Libya
In March 2011, as forces loyal to Muammar Gaddafi advanced on rebels across Libya, formal calls for a no-fly zone came in from around the world, including Europe, the Arab League, and a resolution passed unanimously by the U.S. Senate. In response to the unanimous passage of United Nations Security Council Resolution 1973 on March 17, Gaddafi who had previously vowed to "show no mercy" to the citizens of Benghazi—announced an immediate cessation of military activities, yet reports came in that his forces continued shelling Misrata. The next day, on Obama's orders, the U.S. military took a lead role in air strikes to destroy the Libyan government's air defense capabilities in order to protect civilians and enforce a no-fly-zone, including the use of Tomahawk missiles, B-2 Spirits, and fighter jets.Six days later, on March 25, by unanimous vote of all of its 28 members, NATO took over leadership of the effort, dubbed Operation Unified Protector.Some Representatives questioned whether Obama had the constitutional authority to order military action in addition to questioning its cost, structure and aftermath.

 Afghanistan
Early in his presidency, Obama moved to bolster U.S. troop strength in Afghanistan.He announced an increase to U.S. troop levels of 17,000 in February 2009 to "stabilize a deteriorating situation in Afghanistan", an area he said had not received the "strategic attention, direction and resources it urgently requires".He replaced the military commander in Afghanistan, General David D. McKiernan, with former Special Forces commander Lt. Gen. Stanley A. McChrystal in May 2009, indicating that McChrystal's Special Forces experience would facilitate the use of counterinsurgency tactics in the war. On December 1, 2009, Obama announced the deployment of an additional 30,000 military personnel to Afghanistan.He also proposed to begin troop withdrawals 18 months from that date.McChrystal was replaced by David Petraeus in June 2010 after McChrystal's staff criticized White House personnel in a magazine article.

Iraq
During his presidential transition, President-elect Obama announced that he would retain the incumbent Defense Secretary, Robert Gates, in his Cabinet.
On February 27, 2009, Obama declared that combat operations would end in Iraq within 18 months. His remarks were made to a group of Marines preparing for deployment to Afghanistan. Obama said, "Let me say this as plainly as I can: By August 31, 2010, our combat mission in Iraq will end. The Obama administration scheduled the withdrawal of combat troops to be completed by August 2010, decreasing troops levels from 142,000 while leaving a transitional force of 35,000 to 50,000 in Iraq until the end of 2011. On August 19, 2010, the last United States combat brigade exited Iraq. The plan is to transition the mission of the remaining troops from combat operations to counter-terrorism and the training, equipping, and advising of Iraqi security forces. On August 31, 2010, Obama announced that the United States combat mission in Iraq was over.On October 21, 2011 President Obama announced that all U.S. troops would leave Iraq in time to be, "home for the holidays.

Israel
During the initial years of the Obama administration, the U.S. increased military cooperation with Israel, including a record number of U.S. troops participating in military exercises in the country, increased military aid, and the re-establishment of the U.S.-Israeli Joint Political Military Group and the Defense Policy Advisory Group. It was reported high-ranking defense officials from both countries had been making an unusual number of trips between the two countries, including Ehud Barak. Part of the military aid increase in 2010 was to fund Israel's missile defense shield. Before his retirement in September 2011, Adm. Mike Mullen, former Chairman of the Joint Chiefs of Staff, made four trips to Israel during his four-year tenure, two of them in 2010. Prior to 2007 no Chairman of the Joint Chiefs had done so for over ten years.
In 2011, Obama's Ambassador to the United Nations vetoed a resolution condemning Israeli settlements, with the U.S. the only nation on the Security Council doing so. Like previous American presidential administrations, Obama supports the two-state solution to the Arab-Israeli conflict based on the 1967 borders with land swaps.

Osama bin Laden
Starting with information received in July 2010, intelligence developed by the CIA over the next several months determined what they believed to be the location of Osama bin Laden in a large compound in Abbottabad, Pakistan, a suburban area 35 miles from Islamabad. CIA head Leon Panetta reported this intelligence to President Obama in March 2011. Meeting with his national security advisers over the course of the next six weeks, Obama rejected a plan to bomb the compound, and authorized a "surgical raid" to be conducted by United States Navy SEALs. The operation took place on May 1, 2011, resulting in the death of bin Laden and the seizure of papers and computer drives and disks from the compound. Bin Laden's body was identified through DNA testing, and buried at sea several hours later.Within minutes of the President's announcement from Washington, DC, late in the evening on May 1, there were spontaneous celebrations around the country as crowds gathered outside the White House, and at New York City's Ground Zero and Times Square.Reaction to the announcement was positive across party lines, including from former Presidents Bill Clinton and George W. Bush, and from many countries around the world.

2010 midterm election

Obama called the November 2, 2010 election, where the Democratic Party lost 63 seats in, and control of, the House of Representatives, "humbling" and a "shellacking". He said that the results came because not enough Americans had felt the effects of the economic recovery.

Leonardo da Vinci's lifes

Leonardo da Vinci

Leonardo di ser Piero da Vinci ( pronunciation (help·info)) (April 15, 1452 – May 2, 1519, Old Style) was an Italian Renaissance polymath: painter, sculptor, architect, musician, scientist, mathematician, engineer, inventor, anatomist, geologist, cartographer, botanist and writer whose genius, perhaps more than that of any other figure, epitomized the Renaissance humanist ideal. Leonardo has often been described as the archetype of the Renaissance Man, a man of "unquenchable curiosity" and "feverishly inventive imagination".[1] He is widely considered to be one of the greatest painters of all time and perhaps the most diversely talented person ever to have lived.[2] According to art historian Helen Gardner, the scope and depth of his interests were without precedent and "his mind and personality seem to us superhuman, the man himself mysterious and remote".[1] Marco Rosci points out, however, that while there is much speculation about Leonardo, his vision of the world is essentially logical rather than mysterious, and that the empirical methods he employed were unusual for his time.[3]
Born out of wedlock to a notary, Piero da Vinci, and a peasant woman, Caterina, at Vinci in the region of Florence, Leonardo was educated in the studio of the renowned Florentine painter, Verrocchio. Much of his earlier working life was spent in the service of Ludovico il Moro in Milan. He later worked in Rome, Bologna and Venice, and he spent his last years in France at the home awarded him by Francis I.

Life

Childhood, 1452–1466
Leonardo was born on April 15, 1452 (Old Style), "at the third hour of the night"[nb 5] in the Tuscan hill town of Vinci, in the lower valley of the Arno River in the territory of the Medici-ruled Republic of Florence.[8] He was the out-of-wedlock son of the wealthy Messer Piero Fruosino di Antonio da Vinci, a Florentine legal notary, and Caterina, a peasant.[7][9][nb 6] Leonardo had no surname in the modern sense, “da Vinci” simply meaning “of Vinci”: his full birth name was "Lionardo di ser Piero da Vinci", meaning "Leonardo, (son) of (Mes)ser Piero from Vinci".[8] The inclusion of the title "ser" indicated that Leonardo's father was a gentleman.
Little is known about Leonardo's early life. He spent his first five years in the hamlet of Anchiano in the home of his mother, then from 1457 he lived in the household of his father, grandparents and uncle, Francesco, in the small town of Vinci. His father had married a sixteen-year-old girl named Albiera, who loved Leonardo but died young.[10] When Leonardo was sixteen his father married again, to twenty-year-old Francesca Lanfredini. It was not until his third and fourth marriages that Ser Piero produced legitimate heirs.[11]

Professional life, 1476–1513
Florentine court records of 1476 show that Leonardo and three other young men were charged with sodomy and acquitted.[9][nb 10] From that date until 1478 there is no record of his work or even of his whereabouts.[21] In 1478 he left Verrocchio's studio and was no longer resident at his father's house. One writer, the "Anonimo" Gaddiano claims that in 1480 he was living with the Medici and working in the Garden of the Piazza San Marco in Florence, a Neo-Platonic academy of artists, poets and philosophers that the Medici had established.[9] In January 1478, he received his first of two independent commissions: to paint an altarpiece for the Chapel of St. Bernard in the Palazzo Vecchio and, in March 1481, The Adoration of the Magi for the Monks of San Donato a Scopeto.[22] Neither commission was completed, the second being interrupted when Leonardo went to Milan.
In 1482 Leonardo, who according to Vasari was a most talented musician,[23] created a silver lyre in the shape of a horse's head. Lorenzo de' Medici sent Leonardo to Milan, bearing the lyre as a gift, to secure peace with Ludovico il Moro, Duke of Milan.[24] At this time Leonardo wrote an often-quoted letter describing the many marvellous and diverse things that he could achieve in the field of engineering and informing Ludovico that he could also paint.
n Cesena, in 1502 Leonardo entered the service of Cesare Borgia, the son of Pope Alexander VI, acting as a military architect and engineer and travelling throughout Italy with his patron.[28] Leonardo created a map of Cesare Borgia's stronghold, a town plan of Imola in order to win his patronage. Maps were extremely rare at the time and it would have seemed like a new concept; upon seeing it, Cesare hired Leonardo as his chief military engineer and architect. Later in the year, Leonardo produced another map for his patron, one of Chiana Valley, Tuscany so as to give his patron a better overlay of the land and greater strategic position. He created this map in conjunction with his other project of constructing a dam from the sea to Florence in order to allow a supply of water to sustain the canal during all seasons.
Leonardo returned to Florence where he rejoined the Guild of St Luke on October 18, 1503, and spent two years designing and painting a mural of The Battle of Anghiari for the Signoria,[28] with Michelangelo designing its companion piece, The Battle of Cascina.[nb 13] In Florence in 1504, he was part of a committee formed to relocate, against the artist's will, Michelangelo's statue of David.[33]
In 1506 Leonardo returned to Milan. Many of his most prominent pupils or followers in painting either knew or worked with him in Milan,[10] including Bernardino Luini, Giovanni Antonio Boltraffio and Marco D'Oggione.[nb 14] However, he did not stay in Milan for long because his father had died in 1504, and in 1507 he was back in Florence trying to sort out problems with his brothers over his father's estate. By 1508 Leonardo was back in Milan, living in his own house in Porta Orientale in the parish of Santa Babila.


Verrocchio's workshop, 1466–1476

In 1466, at the age of fourteen, Leonardo was apprenticed to the artist Andrea di Cione, known as Verrocchio, whose workshop was "one of the finest in Florence".[15] Other famous painters apprenticed or associated with the workshop include Domenico Ghirlandaio, Perugino, Botticelli, and Lorenzo di Credi.[10][16] Leonardo would have been exposed to both theoretical training and a vast range of technical skills[17] including drafting, chemistry, metallurgy, metal working, plaster casting, leather working, mechanics and carpentry as well as the artistic skills of drawing, painting, sculpting and modelling.[18][nb 7]
Much of the painted production of Verrocchio's workshop was done by his employees. According to Vasari, Leonardo collaborated with Verrocchio on his Baptism of Christ, painting the young angel holding Jesus' robe in a manner that was so far superior to his master's that Verrocchio put down his brush and never painted again.[19] On close examination, the painting reveals much that has been painted or touched up over the tempera using the new technique of oil paint, with the landscape, the rocks that can be seen through the brown mountain stream and much of the figure of Jesus bearing witness to the hand of Leonardo.[20] Leonardo may have been the model for two works by Verrocchio: the bronze statue of David in the Bargello and the Archangel Raphael in Tobias and the Angel.



Florence — Leonardo's artistic and social background
Florence, at the time of Leonardo's youth, was the centre of Christian Humanist thought and culture.[42] Leonardo commenced his apprenticeship with Verrocchio in 1466, the year that Verrocchio's master, the great sculptor Donatello, died. The painter Uccello, whose early experiments with perspective were to influence the development of landscape painting, was a very old man. The painters Piero della Francesca and Fra Filippo Lippi, sculptor Luca della Robbia, and architect and writer Leon Battista Alberti were in their sixties. The successful artists of the next generation were Leonardo's teacher Verrocchio, Antonio Pollaiuolo and the portrait sculptor, Mino da Fiesole whose lifelike busts give the most reliable likenesses of Lorenzo Medici's father Piero and uncle Giovanni.[43][44][45][46]
Leonardo's youth was spent in a Florence that was ornamented by the works of these artists and by Donatello's contemporaries, Masaccio whose figurative frescoes were imbued with realism and emotion and Ghiberti whose Gates of Paradise, gleaming with gold leaf, displayed the art of combining complex figure compositions with detailed architectural backgrounds. Piero della Francesca had made a detailed study of perspective,[47] and was the first painter to make a scientific study of light. These studies and Alberti's Treatise[48] were to have a profound effect on younger artists and in particular on Leonardo's own observations and artworks.

Old age, 1513–1519
From September 1513 to 1516, Leonardo spent much of his time living in the Belvedere in the Vatican in Rome, where Raphael and Michelangelo were both active at the time.[34] In October 1515, Francis I of France recaptured Milan.[22] On December 19, Leonardo was present at the meeting of Francis I and Pope Leo X, which took place in Bologna.[10][35][36] Leonardo was commissioned to make for Francis a mechanical lion which could walk forward, then open its chest to reveal a cluster of lilies.[37][nb 15] In 1516, he entered François' service, being given the use of the manor house Clos Lucé[nb 16] near the king's residence at the royal Château d'Amboise. It was here that he spent the last three years of his life, accompanied by his friend and apprentice, Count Francesco Melzi, and supported by a pension totalling 10,000 scudi.
Some twenty years after Leonardo's death, Francis was reported by the goldsmith and sculptor Benevenuto Cellini as saying: "There had never been another man born in the world who knew as much as Leonardo, not so much about painting, sculpture and architecture, as that he was a very great philosopher.

Assistants and pupils
Gian Giacomo Caprotti da Oreno, nicknamed Salai or Il Salaino ("The Little Unclean One" i.e., the devil), entered Leonardo's household in 1490. After only a year, Leonardo made a list of his misdemeanours, calling him "a thief, a liar, stubborn, and a glutton", after he had made off with money and valuables on at least five occasions and spent a fortune on clothes.[60] Nevertheless, Leonardo treated him with great indulgence, and he remained in Leonardo's household for the next thirty years.[61] Salai executed a number of paintings under the name of Andrea Salai, but although Vasari claims that Leonardo "taught him a great deal about painting",[37] his work is generally considered to be of less artistic merit than others among Leonardo's pupils, such as Marco d'Oggione and Boltraffio. In 1515, he painted a nude version of the Mona Lisa, known as Monna Vanna.[62] Salai owned the Mona Lisa at the time of his death in 1525, and in his will it was assessed at 505 lire, an exceptionally high valuation for a small panel portrait.[63]
In 1506, Leonardo took on another pupil, Count Francesco Melzi, the son of a Lombard aristocrat, who is considered to have been his favourite student. He travelled to France with Leonardo and remained with him until Leonardo's death.[10] Melzi inherited the artistic and scientific works, manuscripts, and collections of Leonardo and administered the estate.

Early works
Leonardo's early works begin with the Baptism of Christ painted in conjunction with Verrocchio. Two other paintings appear to date from his time at the workshop, both of which are Annunciations. One is small, 59 centimetres (23 in) long and 14 centimetres (5.5 in) high. It is a "predella" to go at the base of a larger composition, in this case a painting by Lorenzo di Credi from which it has become separated. The other is a much larger work, 217 centimetres (85 in) long.[66] In both these Annunciations, Leonardo used a formal arrangement, such as in Fra Angelico's two well known pictures of the same subject, of the Virgin Mary sitting or kneeling to the right of the picture, approached from the left by an angel in profile with rich flowing garment, raised wings and bearing a lily. Although previously attributed to Ghirlandaio, the larger work is now generally attributed to Leonardo.


Painting

Despite the recent awareness and admiration of Leonardo as a scientist and inventor, for the better part of four hundred years his fame rested on his achievements as a painter and on a handful of works, either authenticated or attributed to him that have been regarded as among the masterpieces.[64]
These paintings are famous for a variety of qualities which have been much imitated by students and discussed at great length by connoisseurs and critics. Among the qualities that make Leonardo's work unique are the innovative techniques that he used in laying on the paint, his detailed knowledge of anatomy, light, botany and geology, his interest in physiognomy and the way in which humans register emotion in expression and gesture, his innovative use of the human form in figurative composition, and his use of the subtle gradation of tone. All these qualities come together in his most famous painted works, the Mona Lisa, the Last Supper and the Virgin of the Rocks.

Paintings of the 1480s
In the 1480s Leonardo received two very important commissions and commenced another work which was also of ground-breaking importance in terms of composition. Two of the three were never finished, and the third took so long that it was subject to lengthy negotiations over completion and payment. One of these paintings is that of St. Jerome in the Wilderness. Bortolon associates this picture with a difficult period of Leonardo's life, as evidenced in his diary: "I thought I was learning to live; I was only learning to die."[10]
Although the painting is barely begun, the composition can be seen and it is very unusual.[nb 21] Jerome, as a penitent, occupies the middle of the picture, set on a slight diagonal and viewed somewhat from above. His kneeling form takes on a trapezoid shape, with one arm stretched to the outer edge of the painting and his gaze looking in the opposite direction. J. Wasserman points out the link between this painting and Leonardo's anatomical studies.[69] Across the foreground sprawls his symbol, a great lion whose body and tail make a double spiral across the base of the picture space. The other remarkable feature is the sketchy landscape of craggy rocks against which the figure is silhouetted.


Paintings of the 1490s
Leonardo's most famous painting of the 1490s is The Last Supper, painted for the refectory of the Convent of Santa Maria della Grazie in Milan. The painting represents the last meal shared by Jesus with his disciples before his capture and death. It shows specifically the moment when Jesus has just said "one of you will betray me". Leonardo tells the story of the consternation that this statement caused to the twelve followers of Jesus.[16]
The novelist Matteo Bandello observed Leonardo at work and wrote that some days he would paint from dawn till dusk without stopping to eat and then not paint for three or four days at a time.[72] This was beyond the comprehension of the prior, who hounded him until Leonardo asked Ludovico to intervene. Vasari describes how Leonardo, troubled over his ability to adequately depict the faces of Christ and the traitor Judas, told the Duke that he might be obliged to use the prior as his model.


Paintings of the 1500s
Among the works created by Leonardo in the 16th century is the small portrait known as the Mona Lisa or "la Gioconda", the laughing one. In the present era it is arguably the most famous painting in the world. Its fame rests, in particular, on the elusive smile on the woman's face, its mysterious quality brought about perhaps by the fact that the artist has subtly shadowed the corners of the mouth and eyes so that the exact nature of the smile cannot be determined. The shadowy quality for which the work is renowned came to be called "sfumato" or Leonardo's smoke. Vasari, who is generally thought to have known the painting only by repute, said that "the smile was so pleasing that it seemed divine rather than human; and those who saw it were amazed to find that it was as alive as the original".[77][nb 22]
Other characteristics found in this work are the unadorned dress, in which the eyes and hands have no competition from other details, the dramatic landscape background in which the world seems to be in a state of flux, the subdued colouring and the extremely smooth nature of the painterly technique, employing oils, but laid on much like tempera and blended on the surface so that the brushstrokes are indistinguishable.[nb 23] Vasari expressed the opinion that the manner of painting would make even "the most confident master ... despair and lose heart."[80] The perfect state of preservation and the fact that there is no sign of repair or overpainting is rare in a panel painting of this date.[81]
In the painting Virgin and Child with St. Anne the composition again picks up the theme of figures in a landscape which Wasserman describes as "breathtakingly beautiful"[82] and harkens back to the St Jerome picture with the figure set at an oblique angle. What makes this painting unusual is that there are two obliquely set figures superimposed. Mary is seated on the knee of her mother, St Anne. She leans forward to restrain the Christ Child as he plays roughly with a lamb, the sign of his own impending sacrifice.[16] This painting, which was copied many times, influenced Michelangelo, Raphael, and Andrea del Sarto,[83] and through them Pontormo and Correggio. The trends in composition were adopted in particular by the Venetian painters Tintoretto and Veronese.


Scientific studies

Leonardo's approach to science was an observational one: he tried to understand a phenomenon by describing and depicting it in utmost detail and did not emphasize experiments or theoretical explanation. Since he lacked formal education in Latin and mathematics, contemporary scholars mostly ignored Leonardo the scientist, although he did teach himself Latin. In the 1490s he studied mathematics under Luca Pacioli and prepared a series of drawings of regular solids in a skeletal form to be engraved as plates for Pacioli's book De Divina Proportione, published in 1509.[16]
It appears that from the content of his journals he was planning a series of treatises to be published on a variety of subjects. A coherent treatise on anatomy was said to have been observed during a visit by Cardinal Louis 'D' Aragon's secretary in 1517.[89] Aspects of his work on the studies of anatomy, light and the landscape were assembled for publication by his pupil Francesco Melzi and eventually published as Treatise on Painting by Leonardo da Vinci in France and Italy in 1651 and Germany in 1724,[90] with engravings based upon drawings by the Classical painter Nicholas Poussin.[citation needed] According to Arasse, the treatise, which in France went into sixty two editions in fifty years, caused Leonardo to be seen as "the precursor of French academic thought on art".

Journals and notes
Renaissance humanism recognized no mutually exclusive polarities between the sciences and the arts, and Leonardo's studies in science and engineering are as impressive and innovative as his artistic work.[16] These studies were recorded in 13,000 pages of notes and drawings, which fuse art and natural philosophy (the forerunner of modern science), made and maintained daily throughout Leonardo's life and travels, as he made continual observations of the world around him.[16]
Leonardo's writings are mostly in mirror-image cursive. The reason may have been more a practical expediency than for reasons of secrecy as is often suggested. Since Leonardo wrote with his left hand, it is probable that it was easier for him to write from right to left.
His notes and drawings display an enormous range of interests and preoccupations, some as mundane as lists of groceries and people who owed him money and some as intriguing as designs for wings and shoes for walking on water. There are compositions for paintings, studies of details and drapery, studies of faces and emotions, of animals, babies, dissections, plant studies, rock formations, whirlpools, war machines, helicopters and architecture.

Engineering and inventions
During his lifetime Leonardo was valued as an engineer. In a letter to Ludovico il Moro he claimed to be able to create all sorts of machines both for the protection of a city and for siege. When he fled to Venice in 1499 he found employment as an engineer and devised a system of moveable barricades to protect the city from attack. He also had a scheme for diverting the flow of the Arno River, a project on which Niccolò Machiavelli also worked.[94][95] Leonardo's journals include a vast number of inventions, both practical and impractical. They include musical instruments, hydraulic pumps, reversible crank mechanisms, finned mortar shells, and a steam cannon.[10][16]
In 1502, Leonardo produced a drawing of a single span 720-foot (220 m) bridge as part of a civil engineering project for Ottoman Sultan Beyazid II of Constantinople. The bridge was intended to span an inlet at the mouth of the Bosporus known as the Golden Horn. Beyazid did not pursue the project because he believed that such a construction was impossible. Leonardo's vision was resurrected in 2001 when a smaller bridge based on his design was constructed in Norway.[96] On May 17, 2006, the Turkish government decided to construct Leonardo's bridge to span the Golden Horn.

Anatomy
Leonardo's formal training in the anatomy of the human body began with his apprenticeship to Andrea del Verrocchio, who insisted that all his pupils learn anatomy. As an artist, he quickly became master of topographic anatomy, drawing many studies of muscles, tendons and other visible anatomical features.
As a successful artist, he was given permission to dissect human corpses at the Hospital of Santa Maria Nuova in Florence and later at hospitals in Milan and Rome. From 1510 to 1511 he collaborated in his studies with the doctor Marcantonio della Torre. Leonardo made over 200 pages of drawings and many pages of notes towards a treatise on anatomy. These papers were left to his heir, Francesco Melzi, for publication, a task of overwhelming difficulty because of its scope and Leonardo's idiosyncratic writing.[92] It was left incomplete at the time of Melzi's death more than fifty years later, with only a small amount of the material on anatomy included in Leonardo's Treatise on painting, published in France in 1632.[16][92] During the time that Melzi was ordering the material into chapters for publication, they were examined by a number of anatomists and artists, including Vasari, Cellini and Albrecht Dürer who made a number of drawings from them.

Engineering and inventions

During his lifetime Leonardo was valued as an engineer. In a letter to Ludovico il Moro he claimed to be able to create all sorts of machines both for the protection of a city and for siege. When he fled to Venice in 1499 he found employment as an engineer and devised a system of moveable barricades to protect the city from attack. He also had a scheme for diverting the flow of the Arno River, a project on which Niccolò Machiavelli also worked.[94][95] Leonardo's journals include a vast number of inventions, both practical and impractical. They include musical instruments, hydraulic pumps, reversible crank mechanisms, finned mortar shells, and a steam cannon.[10][16]
In 1502, Leonardo produced a drawing of a single span 720-foot (220 m) bridge as part of a civil engineering project for Ottoman Sultan Beyazid II of Constantinople. The bridge was intended to span an inlet at the mouth of the Bosporus known as the Golden Horn. Beyazid did not pursue the project because he believed that such a construction was impossible. Leonardo's vision was resurrected in 2001 when a smaller bridge based on his design was constructed in Norway.[96] On May 17, 2006, the Turkish government decided to construct Leonardo's bridge to span the Golden Horn............