A detail from what is thought to be one of only three existing manuscripts containing Einstein's most famous formula about the relationship between energy, mass and the speed of light — in his handwriting. Sean Carberry/NPR hide caption

toggle caption Sean Carberry/NPR

The Two-Way

Brilliant Idea: More Than 80,000 Of Einstein's Documents Going Online

They include work related to his most famous formula — E=mc² — and personal papers, such as letters to and from his former mistresses.

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