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Navel Stone: What It Is, Causes, and Removal
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What Purpose Does the Belly Button Serve? | Mental Floss
Why Does Your Belly Button Smell?
Causes Of A Smelly Belly Button And What You Can Do About It
There are six types of belly buttons… and here's what yours says about you | The US Sun
Why Do We Have Belly Buttons? | WowScience - Science games and activities for kids
