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- Kissing goes back 21 million years, to the common ancestor of humans and other large apes, study finds Live Science
- Kissing is an ‘evolutionary conundrum.’ Scientists just mapped its unexpected origins CNN
- 21-million-year-old smooch: The very first kiss occurred before humans, study says ABC News
- Neanderthals also kissed: A gesture of love that is 21 million years old EL PAÍS English
- Kissing Has Existed for at Least 16 Million Years, Scientists Say The New York Times
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