The Two-Page Letter That Started the Atomic Age
On August 2, 1939, Albert Einstein signed a letter to President Roosevelt warning that Germany might build an atomic bomb — a letter that set the Manhattan Project in motion.
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The Paper That Rewrote Gravity Arrived on March 20, 1916
On March 20, 1916, Annalen der Physik received Einstein's "Foundation of the General Theory of Relativity," the paper that rewrote our understanding of gravity.