- published: 01 Jul 2011
- views: 76738
Richard Phillips Feynman, (/ˈfaɪnmən/; May 11, 1918 – February 15, 1988) was an American theoretical physicist known for his work in the path integral formulation of quantum mechanics, the theory of quantum electrodynamics, and the physics of the superfluidity of supercooled liquid helium, as well as in particle physics for which he proposed the parton model. For his contributions to the development of quantum electrodynamics, Feynman, jointly with Julian Schwinger and Sin-Itiro Tomonaga, received the Nobel Prize in Physics in 1965. He developed a widely used pictorial representation scheme for the mathematical expressions governing the behavior of subatomic particles, which later became known as Feynman diagrams. During his lifetime, Feynman became one of the best-known scientists in the world. In a 1999 poll of 130 leading physicists worldwide by the British journal Physics World he was ranked as one of the ten greatest physicists of all time.
He assisted in the development of the atomic bomb during World War II and became known to a wide public in the 1980s as a member of the Rogers Commission, the panel that investigated the Space Shuttle Challenger disaster. In addition to his work in theoretical physics, Feynman has been credited with pioneering the field of quantum computing, and introducing the concept of nanotechnology. He held the Richard C. Tolman professorship in theoretical physics at the California Institute of Technology.
African Americans (also referred to as Black Americans or Afro-Americans) are an ethnic group of Americans (citizens or residents of the United States) with total or partial ancestry from any of the Black racial groups of Africa. The term may also be used to include only those individuals who are descended from enslaved Africans. As a compound adjective the term is usually hyphenated as African-American.
African Americans constitute the third largest racial and ethnic group in the United States (after White Americans and Hispanic and Latino Americans). Most African Americans are of West and Central African descent and are descendants of enslaved blacks within the boundaries of the present United States. On average, African Americans are of 78 percent West African, 19 percent European and 3 percent Native American heritage, with very large variation between individuals. Immigrants from some African, Caribbean, Central American, and South American nations and their descendants may or may not also self-identify with the term.
hey you this is a nice day
beside you
it´s only me
standing in front of you
your soul
is so bright
i like the way
you look at me
it´s so easy to feel ok
everyday beside you
you are a girl
beautiful
your eyes i look
into them
if you feel good
í´m in the need of (you)
to get another view
when we all stop trying