Kaplan cautioned that, while apes are good at remembering to tighten bonds, some humans today might be missing out on this simple, primal need.
"So many people now, stuck behind computers and iPads, are missing out on their experience of touch," she said. "I am not surprised that depression and suicide are on the increase as a result of serious physical self-alienation."
So, remember to occasionally channel your wild, ape ancestors: Reach out and give a friend an actual hug (or even just pick a piece of dust out of his beard). It's good for you.