This handout photo released by courtesy of RR Auction shows a handwritten letter from Albert Einstein to Polish-U.S. physicist Ludwik Silberstein, dated October 26, 1946, in which Einstein wrote out the equation "E = mc2" (top R) in German. The letter was sold for $1,243,707 during the auction from May 13 to 20, 2021. (Photos: Agencies)
This handout photo released by courtesy of RR Auction shows a handwritten letter from Albert Einstein to Polish-U.S. physicist Ludwik Silberstein, dated October 26, 1946, in which Einstein wrote out the equation "E = mc2" (top R) in German. The letter was sold for $1,243,707 during the auction from May 13 to 20, 2021.
This handout photo released by courtesy of RR Auction shows a handwritten letter from Albert Einstein to Polish-U.S. physicist Ludwik Silberstein, dated October 26, 1946, in which Einstein wrote out the equation "E = mc2" (top R) in German. The letter was sold for $1,243,707 during the auction from May 13 to 20, 2021.
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