- Only two similar examples of world-changing equation known
- 1946 letter to physicist Ludwik Silberstein auctioned
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.
Related: Albert Einstein’s ‘God letter’ reflecting on religion auctioned for $3m
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