The human body.
We all have one and think we know it well.
But did you also know the following facts about that body of yours ?

Eyes are unique

A human's eyes can over 10 million different colors distinct, and each person's irises are as unique as fingerprints.

Your stomach creates a new layer of mucous membrane every three to four days

This is necessary to prevent the acids in your stomach from eating up your stomach lining.

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