WHEN the great library at Alexandria went up in flames, it is said that the books took six months to burn. We can’t know if this is true. Exactly how the library met its end, and whether it even existed, have been subjects of speculation for more than 2,000 years. For two millennia, we’ve been haunted by the idea that what has been passed down to us might not be representative of the vast corpus of literature and knowledge that humans have created. It’s a fear that has only been confirmed by new methods for estimating the extent of the losses…

This article first appeared in The Guardian on 28 May 2022. To continue reading, click here.