- Humans and apes have shared a laugh for 15 million years, says study France 24
- Rhythm and timing in laughter reveal that human vocal plasticity falls on a hominid continuum | Communications Biology Nature
- To Reveal the Rhythmic Roots of Laughter, Just Tickle an Ape The New York Times
- Scientists Tickled Gorillas And Found A 15-Million-Year-Old Clue To How Humans Learned Speech Forbes
- Apes and humans have been sharing a laugh for 15 million years Phys.org
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