Medicine 3 (IMAGE) University College London Caption Hunter-gatherer ancestors, from around 300,000 years ago, facilitated a cultural revolution by developing ideas in small social networks, and regularly drawing on knowledge from neighbouring camps, suggests a new study by UCL and University of Zurich. Credit UCL and University of Zurich Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.