A new study suggests humans and great apes have been giggling in similar ways dating back 15 million years. 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 bonob... [2462 chars]
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