I have just discovered a profoundly human, evolutionarily crucial fact about the new baby in our house: He likes to be tickled. This isn’t a joke. For centuries, the deepest of thinkers—Aristotle, ...

Socrates wondered 2,000 years ago, and Charles Darwin also racked his brains: what is a tickle, and why are we so sensitive to tickling? ‘Tickling is relatively under-researched,’ says neuroscientist ...

Remember the back tickles you loved as a kid, the black magic your mom used to put you straight to sleep? How about the times you almost dozed off while someone played with your hair? Are you relaxed ...