In the words of Dua Lipa, one kiss is all it took about 21 million years ago. That's roughly when scientists estimate that ...

Archaeological records show that communities have had far more faith in the lip-lock than, say, evolutionary biologists do.

Kissing may feel like a very human habit, but new research suggests it has much deeper roots. A team of scientists says the behavior likely began more than 20 million years ago, long before modern ...