We have formalized and ritualized ways of starting and ending social interactions.
Turns out? So do our closest relatives. Chimps and bonobos both do various signals to say hello and goodbye. Bonobos, which are more advanced socially, do it more.
Also, in bonobos, the better they know each other? The shorter the entry and exit signals.
Oh, and just out of interest, one of them is holding hands. They hold hands as a way to show the intent of socialization.
Just how old is the handshake, anyway?
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