Charles Hard Townes (1915-2015) and James P. Gordon (1928-2013), American physicists, presenting their atomic clock from the Columbia university, New York (United States), 1955.      © Jacques Boyer / Roger-Viollet
Charles Hard Townes (1915-2015) and James P. Gordon (1928-2013), American physicists, presenting their atomic clock from the Columbia university, New York (United States), 1955.      © Jacques Boyer / Roger-Viollet

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