One of only three known examples of handwritten letter by Albert Einstein containing his famous E=mc2 equation, penned to physicist who had challenged some of his theories, has sold at auction for three times more than expected.
in Collecting
One of only three known examples of handwritten letter by Albert Einstein containing his famous E=mc2 equation, penned to physicist who had challenged some of his theories, has sold at auction for three times more than expected.
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