If you like to play the game of tag when you were...  ...the chased and vice versa," said researcher Marina Davila Ross , a behavioral biologist at the University of Port...  ...able with a safe crowd of peers and even parents, Davila Ross said. Charles Q. Choi of LiveScie...

Forget DNA! Scientists have re-traced our evolutio...  ...anything by tickling chimps?To investigate that, Marina Davila Ross of the University of Portsmouth in England and co...