A group of scientists is making a provocative argument about the nature of elephants. They posit that these gentle giants have achieved self-domestication, meaning they’ve self-selected for traits commonly found in humans and our domesticated animals, particularly reduced aggression. Not every outside expert agrees with the team’s conclusions, though.
Kissing is so commonplace that most people rarely think to stop and ask where humans picked up the habit in the first place. Where in humanity’s evolutionary history did smooshing our faces together come to be regarded as a display of lust, care, friendship, and love?