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Antimatter and matter In 1928, the British physicist Paul A.M. Dirac (1902-1984) formulated a theory for the motion of electrons in electric and magnetic fields. Such theories had been formulated before, but what was unique about Dirac's was that his included the effects of Einstein's Special Theory of Relativity. Dirac's equations worked exceptionally well, describing many attributes of electron motion that previous equations could not. But his theory also led to a surprising prediction that the electron must have an "antiparticle," having the same mass but a positive electrical charge (the opposite of a normal electron's negative charge). In 1932 Carl Anderson observed this new particle experimentally and it was named the "positron." This was the first known example of antimatter. In 1955 the antiproton was produced at the Berkeley Bevatron, and in 1995 scientists created the first anti-hydrogen atom at the CERN research facility in Europe by combining the anti-proton with...

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