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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)

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The Book, Volume 1: Page 9, Picture 9, February 1944, Professor Albert Einstein in his home in the suburbs of Princeton, New Jersey, U,S,A (Photo by Popperfoto/Getty Images)

The Book, Volume 1: Page 9, Picture 9, February 1944, Professor Albert Einstein in his home in the suburbs of Princeton, New Jersey, U,S,A  (Photo by Popperfoto/Getty Images)

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Picture dated 1931 of German-born Swiss-US physicist Albert Einstein (1879-1955), author of theory of relativity, awarded the Nobel Prize for Physics in 1921, playing the violin. (Photo credit should read -/AFP/Getty Images)

Picture dated 1931 of German-born Swiss-US physicist Albert Einstein (1879-1955), author of theory of relativity, awarded the Nobel Prize for Physics in 1921, playing the violin. (Photo credit should read -/AFP/Getty Images)

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German-born Swiss-US physicist Albert Einstein (1879-1955), author of theory of relativity, awarded the Nobel Prize for Physics in 1921, on his 75nd birthday, 15 march 1954 in Princeton University. (Photo credit should read -/AFP/Getty Images)

German-born Swiss-US physicist Albert Einstein (1879-1955), author of theory of relativity, awarded the Nobel Prize for Physics in 1921, on his 75nd birthday, 15 march 1954 in Princeton University. (Photo credit should read -/AFP/Getty Images)