Letter by Albert Einstein containing his famous equation on sale for a staggering £300,000.

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BNPS.co.uk (01202) 558833<br />
Pic: RR Auction/BNPS<br />
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An extremely rare letter by Albert Einstein containing his famous equation has emerged for sale for a staggering £300,000. <br />
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The genius mathematician told a physicist in the 1946 correspondence his question 'can be answered from the E = mc2 formula'.<br />
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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.