Laughter is often called the most human sound. It carries joy, relief, connection, and sometimes even healing. For centuries, we believed that laughter belonged only to us, a special emotional ...

When a slack-mouthed chimpanzee lets loose a husky guffaw, you know he's having a good time. Homo sapiens isn't always so transparent—sometimes when we laugh, we're just being polite—but it turns out ...

Animals that laugh prove that joy is not limited to humans. While laughter is often seen as a uniquely human expression, science shows that several animals produce laughter-like sounds during play, ...