On this day, Albert Einstein was born.

Here is the famous letter written by Einstein to President Franklin D. Roosevelt that is credited with launching what would eventually become known as the Manhattan Project.

This letter was a collaboration between Einstein, physicist Leo Szilard, and economist Alexander Sachs, who had been an administrator of the National Recovery Administration and Roosevelt adviser. Sachs personally delivered the letter to Roosevelt on October 11, 1939. The outbreak of World War II on September 1, 1939 had delayed the delivery.

Source: research.archives.gov

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