Tickle Kids: The laughter and cute antics of young children win everyone's hearts. Sometimes, people tickle them to cheer them up or make them laugh. We assume the child is enjoying themselves and ...

Don’t try this at home, but tickling a gorilla, orangutan, bonobo or chimp can inspire bursts of grunting sounds. Yes, that’s laughter, says Marina Davila Ross of the University of Portsmouth in ...