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Synchronous movement seems to help us form cohesive groups by shifting our thinking from "me" to "we."

Throughout history, the definition of beauty has changed a lot. But beyond individual and contemporary tastes, some things have never really gone out of fashion. Here’s another video by Kurzgesagt.

For some two million years, the lives of our ancestors basically remained unchanged. It was around 20,000 years ago that the behaviourally modern humans began a process that would change our lifestyles forever.