Albert Einstein letter with E=mc2 equation in his own hand sells for $1.2m

[Still Waters]

A handwritten letter by Albert Einstein that contains his famous E=mc2 equation has sold at auction for more than $1.2m, about three times more than it was expected to get, a Boston-based auction house said on Friday.

Archivists at the Einstein Papers Project at the California Institute of Technology and the Hebrew University of Jerusalem say there are only three other known examples of Einstein writing the world-changing equation in his own hand.

RR Auction, which sold the most recent letter, says this fourth example is the only one in a private collection and only became public recently. The auction house had expected it to sell for about $400,000.

https://www.theguardian.com/science/2021/may/21/albert-einstein-letter-e-mc2-equation-in-his-own-hand-sells-for-12m