More than 500,000 years ago, our human ancestors used large, stone tools known as "Acheulean handaxes," to cut meat and wood, and dig for tubers. Often made from flint, these prehistoric oval and pear-shaped tools are flaked on both sides and have a pointed end.Handaxes have long been a source of fascination in our social and cultural history. Prior to the Enlightenment in the 17th and 18th centuries, people thought that they were of natural origin and referred to them as "thunderstones shot from the clouds," according to texts, with the earliest records dating back to the mid-1500s.But researchers from...