The story of the first kiss—21.5 million years ago

www.scientificamerican.com

The story of the first kiss—21.5 million years ago

www.scientificamerican.com

paywallMB to Scientific AmericanEnglish · 10 days ago

Kissing goes back 21.5 million years. How it originated remains a mystery

www.scientificamerican.com

Why the simple act of kissing—which can be traced back 21.5 million years—continues to confound evolutionary biologists

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