NEW YORK (AP) — Humans and great apes have been giggling in similar ways since branching off the evolutionary tree, a new study suggests. How do we know this? Researchers tickled 13 captive apes — including gorillas, orangutans, chimpanzees and bonobos — and recorded the results . The new research reexamined those decades-old recordings and compared them with the newly captured giggles of four young children while they were being tickled and playing at home. It turns out that the chuckles of