Your Paw-some Question | What determines the size and shape of someone's belly button?

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Cosmo and I investigated belly buttons—thanks to WSU nursing professor Cindy Brigham-Althoff.

• Learn more about the placenta with Operation Ouch and Scientific American
• Check out all the belly buttons with Nat Geo
• Find out about placental mammals
• See what's living inside your navel with Nat Geo

Sound effects courtesy Pixabay

 As always, submit burning questions at askdruniverse.wsu.edu.  Who knows where your questions will take us next.