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A biologist once made cheese with belly-button bacteria. Here's how that's possible.

Belly buttons are the first human scar, and about 90% of them are innies. If you have an innie, chances are it’s full of dozens of kinds of bacteria, fungi, and lint — especially if you have a hairy belly. And if your navel is infected, there might also be a cheese-like liquid inside. Yum!

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