An Albert Einstein letter stands on display ahead of an auction by the Guernsey's Auction House on November 4, 2013 in New York City. Two letters, penned by Einstein in 1938, will be auctioned on November 7 at New York City's Arader Galleries. In the letters, Einstein admits in writing that a graduate student better understood the calculus for what Einstein would later create a unified theory of gravity and electromagnetic fields.
{"Image ImageDescription": "NEW YORK, NY - NOVEMBER 04:  An Albert Einstein letter stands on display ahead of an auction by the Guernsey's Auction House on November 4, 2013 in New York City. Two letters, penned by Einstein in 1938, will be auctioned on November 7 at New York City's Arader Galleries. In the letters, Einstein admits in writing that a graduate student better understood the calculus for what Einstein would later create a unified theory of gravity and electromagnetic fields.  (Photo by John Moore/Getty Images)", "Image Copyright": "2013 Getty Images"}