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The E = mc2 formula in the letter
An extremely rare letter by Albert Einstein containing his famous equation has emerged for sale for a staggering £300,000.
The genius mathematician told a physicist in the 1946 correspondence his question 'can be answered from the E = mc2 formula'.
The one page letter, which is signed 'A.Einstein', is one of just a handful of documents known to exist with the equation in Einstein's hand.