- A new analysis suggests kissing on the lips may have evolved 21 million years ago CNN
- First kiss dates back 21 million years, say scientists BBC
- Neanderthals and early humans ‘likely to have kissed’, say scientists The Guardian
- Ape ancestors and Neanderthals likely kissed, new analysis finds Phys.org
- When was the first kiss? Over 17 million years ago, a study suggests. The Washington Post
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