We used to think that geometric engravings were a sure sign of modern cognitive abilities, and experts have long debated over the origins of these behaviors. "Until this discovery, it was assumed that comparable engravings were only made by modern humans?"Homo sapiens?"in Africa, starting about 100,000 years ago," Josephine Joordens of Leiden University says in a news release. Not so, Asian Homo erectus appears to be fully capable of this "modern" behavior as well.