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Murray Gell-Mann (b.1929), US physicist and Nobel Laureate. Educated at Yale and the Massachusetts Institute of Technology, Gell-Mann had a doctorate by the age of 22. Two years later, he introduced the concept of 'strangeness' as a new quantum number, conserved in strong nuclear interactions. The theory allowed the grouping of particle types according to their strangeness and charge, and predicted a particle called the omega minus which was observed in 1964. Gell-Mann introduced the idea of quarks with George Zweig, and later worked with Feynman on neutral currents. In 1969 he received the Nobel Prize for Physics. Photographed at CERN in 1979.
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