A letter written by Albert Einstein in 1939 to then-United States President Franklin D Roosevelt warning that Nazi Germany might harness nuclear research to invent an atomic bomb, which encouraged the US to develop the world’s first nuclear bombs, is going up for auction.

Einstein’s letter warning FDR about threat of Nazi nuclear bomb may sell for $4 million

Abraham Lincoln, George Washington, Franklin D Roosevelt, Theodore Rosevelt, Thomas Jefferson, were the top five presidents of America

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Einstein’s letter warning FDR about threat of Nazi nuclear bomb may sell for $4 million

US presidential 'greatness' survey: Donald Trump comes last