You’ve probably heard about it or maybe have even seen it in the flesh: A woman’s belly button can pop out just like a turkey timer when she’s pregnant. Sure, it’s one of those weird-but-true ...

The belly button — or navel — is where the umbilical cord is joined to the fetus. The umbilical cord runs from the fetus to the placenta. It supplies the fetus with nutrients and oxygen, and carries ...

If you’ve ever looked down at your belly button in wonder, you’re not alone. Navel gazing to contemplate the mysteries of the universe dates back to early Hinduism and ancient Greece. The Greek ...