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Scientists Think They’ve Uncovered the 15-Million-Year-Old Origin of Laughter
Recordings of laughter from humans and other great apes suggest that the distinctive rhythm of "ha ha ha" emerged in a common ancestor that lived at least 15 million years ago.
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forbes.com
Scientists Tickled Gorillas And Found An Old Clue To How Humans Learned Speech
A study of 140 laughter sequences found the same rhythmic timing pattern in humans, chimps, gorillas, bonobos and orangutans.
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nature.com
Oo oo, ha ha: why humans and great apes giggle alike when tickled
The rhythmic patterns of laughter found in apes and humans reveal that complex primate vocal control might have started evolving 15 million years ago.
