Belly button lint is a fact of life for anyone with an “innie,” or concave navel. Regular bathing will usually keep your navel free from lint or other dirt and grime. In very rare cases, dirt, oil, ...
The belly button, it turns out, is one of the least-studied parts of the human body. But one of its great mysteries may now have been solved – why most people have an innie, or concave belly button.
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