Einstein's atomic bomb letter, which he called his 'one great mistake,' just sold for almost $4 million

Einstein's atomic bomb letter, which he called his 'one great mistake,' just sold for almost $4 million

Bettmann via Getty Images

In the summer of 1939, Albert Einstein made what he considered his "one great mistake": signing a letter that would reach the desk of President Franklin Roosevelt and help usher in the nuclear age.

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