- Neanderthals and early humans ‘likely to have kissed’, say scientists The Guardian
- First kiss dates back 21 million years, say scientists BBC
- Neanderthals, Ancient Apes, And Human Ancestors Were All Kissing – Just Not Each Other (Mostly) IFLScience
- Scientists Reveal the Origin of Kissing Newsweek
- Kissing Likely Began 20 Million Years Ago With Ape Ancestors and Neanderthals SciTechDaily
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