Hello there!

Watch: This extremely human behavior was just observed in animals

Raphaela Heesen and Emilie Genty

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How do you start and end a conversation?

With a greeting, of course — be it a handshake, saying hello or goodbye, a hug, nodding, bowing, or waving.

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Greetings are intrinsically human, no matter where you’re from. Scientists previously thought this collective social behavior was also unique to humans.