PhD student Nikolas Sarris was reviewing digital reproductions of ancient manuscripts in Egypt’s St. Catherine’s Monastery when he made a startling discovery: a fragment of the world’s oldest Bible hidden beneath the binding of an 18th-century book. The antique parchment turned out to be part of the Codex Sinaiticus, a Greek-language version of the Bible written more 1,600 years ago. Portions of the Codex, the earliest known version of the Bible, are kept at four institutions around the world: The British Library, the National Library of Russia, St. Catharine’s Monastery and the Leipzig University Library. It was only this year that academics from the four repositories worked together to put the entire Codex online.