Albert Einstein's Handwritten Mass Equation

The only known privately owned example of the equation E=mc2 written out by Albert Einstein has made its way to auction. Addressed to physicist Dr. Ludwik Silberstein, the handwritten letter is dated October 26, 1946, and reads, "Your question can be answered from the E = mc2 formula, without any erudition." It's written entirely in German and was kept in Silberstein's archives until recently when it was sold by RR Auctions. Predicted to bring around $400,000, the rare document far exceeded expectations when a bidding war raised the selling price to over $1.2 million.

Photos: RR Auctions

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