We cannot test the behaviour of people who lived tens of thousands of years ago, but archaeology can reveal clues. Symbolic objects, changing settlement patterns and the environments our ancestors were able to survive in all tell part of the story.
One recent study suggests something important may have shifted around 70,000 years ago, when Homo sapiens began expanding into more challenging environments, from deeper forests to drier deserts.
One possibility is that growing social networks helped drive that change. As different communities met, exchanged ideas and shared technologies, each group may have become better equipped to survive, allowing people to spread even further and connect with even more communities.
Watch the full video https://youtu.be/54AK8kIGkms
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