title: Oldest stone tools raise questions about their creators.
authors.forename: Ewen
authors.initials: E
authors.lastname: Callaway
mesh_terms: D000818:Animals; D005075:Biological Evolution; D003468:Cultural Evolution / Q000266:history*; D049690:History, Ancient; D015186:Hominidae; D007360:Intelligence; D053001:Tool Use Behavior; D035501:Uncertainty