An unusual limestone rock found at an archaeological site in Croatia indicates that Neanderthals were capable of incorporating symbolic objects into their culture. ‘Clam-shell’ view of Side A (top) and B showing black dendrites against the background of the brown mudstone. The flake, only shown re-attached on Side A, is the result of a post-excavation fracture of the specimen. Arrows point to large inclusion visible on Sides A and B. Image credit:...