New evidence reveals the complicated history of stone tool use 400,000 - 200,000 years ago.<p> </p><p>Learn more about your ad choices. Visit <a href="https://megaphone.fm/adchoices">megaphone.fm/adchoices</a></p>

Mapping the sea floor and a daily news roundup (3 October 2014)

Weekly podcasts from Science Magazine, the world's leading journal of original scientific research, global news, and commentary.