Best of Summer: The 100-million-year origin story of laughter and humor
Endless Thread
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The Importance of Laughter in Bond Building
Laughter is also called a play vocalization, like in scientific circles. There's a theory that it evolved from heavy breathing,. That's what you're referring to. Laughter may actually be even older. Apes and monkeys and black bears and rats and seals all vocalized during play. This suggests that the first laugh, the first laugh ever, that may have come from a common ancestor, 100 million years ago.
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