BOSTON (AP) — A letter written by Albert Einstein in which he writes out his famous E=mc2 equation has sold at auction for more than $1.2 million, about three times more than it was expected to get. Boston-based RR Auction said Friday that there are only three other known examples of Einstein writing the world-changing equation in his own hand. This fourth example only became public recently. RR Auction had expected it to sell for about $400,000. The one-page handwritten letter in German to a Polish American physicist is dated Oct. 26, 1946. The equation changed physics by demonstrating that time was not absolute and that mass and energy were equivalent.
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