Ticklish laughter appears across primates and triggers ancient brain circuits. Yet after two millennia of inquiry, its evolutionary function remains genuinely unresolved.

NIJMEGEN, Netherlands — Ever try to tickle yourself? Go ahead, stroke your own armpit or foot sole right now. Feel absolutely nothing? That’s because your brain is playing a fascinating trick on you — ...

Scientists have developed a new method to investigate the long-standing mystery of how tickling works, an advance that could have big implications for our understanding of brain development. Humans ...

In the wonderful world of sexuality, nearly anything is possible. Almost anything can be sexually arousing to someone, somewhere. We’re complex creatures, us humans, and our ability to use our ...