Photo of two old books seen edge-on with very soiled pages

Watch out for poisonous books

Though unless you’re a historian with access to rare book archives, you’re probably in the clear. We found that three rare books on various historical topics in the University of Southern Denmark’s library collection contain large concentrations of arsenic on their covers. The books come from the 16th and 17th centuries. — Read on www.popsci.com/poisonous-books

 · Laura Lis Scott