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Paul Dirac, caricature
Paul Dirac (1834-1923). Caricature of the British theoretical physicist Paul Adrien Maurice Dirac, writing on a blackboard. Dirac was a major contributor to the theory of quantum mechanics. His general theory of 1926 was followed, in 1928, by a relativistic theory of quantum mechanics that explained the phenomenon of electron spin. He used his theory to predict the existence of antiparticles such as the positron, the electron's antiparticle, which was observed in 1932. Dirac and Schrodinger shared the 1933 Nobel Prize for Physics.
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