UNITED STATES - DECEMBER 23: While attending a show at the Opera Theatre of New York on December 23, 1930, the German scientist Albert EINSTEIN was approached by a stage manager who presented him with a sheet of paper on which he had given a definition of relativity. Professor EINISTEIN found it correct and signed it at the bottom, with the mention "read and approved". (Photo by Keystone-France/Gamma-Keystone via Getty Images)
