Kiss and tell. Danish historians say evidence of the first mouth-to-mouth smooch can be found on a clay tablet unearthed in the Middle East, the New York Times reported, upending academic theory about ...

Lip kissing is an act that’s so natural and common in many present-day societies it is easily taken for granted. But it’s not actually clear whether people have always been kissing, or whether its ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. “The meeting of ...

A kiss on the lips doesn't always mean romantic love. Some kisses can be confusing, entangle emotions, or happen without a formal relationship. When someone kisses you on the lips without being in a ...

Breakthroughs, discoveries, and DIY tips sent six days a week. Terms of Service and Privacy Policy. Humans are born with instincts for crying and smiling, but not for ...

Why do we kiss our lovers on the lips? We could show romantic passion by rubbing foreheads, locking elbows, or by turning back-to-back and bumping butts. We could even mash our ears together. Legend ...