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Gaillard (left) and Gell-Mann (right) at CERN, the European particle physics laboratory, in April 1972. US particle physicist Mary Katharine Gaillard (born 1939) worked on strong interaction corrections and weak transitions, leading to the successful prediction of the charmed quark mass. She has also worked on electron-positron collisions, and supergravity theories based on superstrings. She was awarded the 1993 J. J. Sakurai Prize for Theoretical Particle Physics. US physicist Murray Gell-Mann (born 1929) worked on the theory of elementary particles. He successfully predicted the existence of a new particle, the omega-minus. In 1964, he postulated quarks as being the fundamental constituents of particles such as protons and neutrons. He was awarded the 1969 Nobel Prize in Physics. Photographed on 17 April 1972.
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