Around 1,300 years ago, a woman leant over a precious book, and etched some letters into the margin, along with some cartoonish drawings. She didn’t use ink – she scratched them in, so they were almost invisible to the naked eye.Until last year, no-one knew they were there.The 8th-Century book – a copy of the Act of Apostles from the Christian New Testament – is now kept in the Bodleian Library in Oxford. Researchers have known for a while that the religious text was probably owned by a woman, but they weren’t sure who.