Sir Isaac Newton's Mathematical Principles of Natural Philosophy is considered to be the most important work in the history of science, and a copy recently sold at auction for an astonishing $31,000 (£24,000), smashing its initial estimate of $10,300-$12,900 (£8,000-£10,000). Published in 1729, this centuries-old tome had been in the anonymous seller's family for generations before they decided to sell it through British auction house Hansons. Just a week before this particular auction, another first-edition copy of the same manuscript was sold at auction, after having been discovered on a bookshelf during a lockdown clean. The book wasn't in as good shape as the volume sold the following week, but still fetched $28,400 (£22,000). These were early examples of the English translation of the book, but the very first editions were published in Latin in 1687. Rarer still, one of these manuscripts sold for £491,250 ($635,000) in 2019 at Christie's.