I still have the first stone hand ax I ever made. It's a pretty poor specimen, crudely chipped from a piece of frost-fractured flint I picked up on a walk through a farmer's field in West Sussex, England. It would not have impressed the human ancestors known to us as Homo heidelbergensis. These cousins of Homo sapiens from 500,000 years ago left much nicer hand axes at a nearby archaeological site in Boxgrove.