Stone Tools are technology 1.0. They’re where it all begins. For millions of years, Stone Tools were our primary piece of technology. At some point we became dependent on them for survival. They became a defining part of what it meant to be human.

Dallas's guest today is John Shea, an anthropologist whose latest book is The Unstoppable Human Species: The Emergence of Homo sapiens in Prehistory.

Edited by Tom Delargy, Produced by Freddy Chick, Senior Producer is Charlotte Long