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28/03/1930 American physicist Jerome Friedman is born

He is known as the co-discoverer of the internal structure of the proton, which is now known as the quarks. Quarks combine to form composite particles called hadrons. The most known hadrons are protons and neutrons. Quarks were discovered between 1968 and 1969 when Friedman worked at the Stanford Linear Accelerator Center with Henry W. Kendall and Richard E. Taylor.


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