A letter penned by Albert Einstein in which he wrote down his famous 'E = mc²' mass–energy equivalence formula has sold at auction for the princely sum of $1.2 million after a furious bidding war.
A letter penned by Albert Einstein which is rare for containing his famous 'E = mc²' mass–energy equivalence formula has gone on sale for the sum of £282,000. The German-born theoretical physicist ...
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