NBC News
By Chantal Da Silva
A rare manuscript featuring early calculations that led to Albert Einstein‘s general theory of relativity sold for just over $13 million at an auction in Paris Tuesday, becoming the most expensive manuscript by the famed scientist.
The 54-page document was originally expected to fetch as much as $3.5 million, but went for nearly quadruple the pre-sale estimate. British auction house Christie’s told NBC News they will not be disclosing who won the final bid.