Friends do it, strangers do it and so do chimpanzees - and it's not just deeply embedded in our history and culture, it may even be written in our DNA. The humble handshake, it turns out, has a rich and surprising history. In this week's episode palaeoanthropologist Ella Al-Shamahi speaks to science broadcaster Helen Czerski about a funny and fascinating voyage of discovery - from the handshake's origins (at least seven million years ago) all the way to its sudden disappearance in March 2020.
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