A rare, 54-page manuscript co-written by Albert Einstein and his lifelong friend and engineer Michele Besso, in which the pair lay out the foundations of Einstein’s famous theory of general relativity, will hit the auction block in Paris on Tuesday (Nov. 23).

According to Christie’s, which is hosting the sale, the document is expected to fetch anywhere between $2.4 million and $3.5 million — potentially making it the most expensive piece of Einstein’s writing ever sold.

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