מחשבות מתחילות כאן
circa 1931: German-born physicist Albert Einstein (1879 - 1955) standing beside a blackboard with chalk-marked mathematical calculations written across it. (Photo by Hulton Archive/Getty Images)
circa 1931: German-born physicist Albert Einstein (1879 - 1955) standing beside a blackboard with chalk-marked mathematical calculations written across it. (Photo by Hulton Archive/Getty Images)