I started out researching this article because I thought it would be funny to shine a scientific light on snot. What do the shades and viscosity mean? How do humans produce so much of it?
But as I tumbled down the snotty rabbit hole, things turned out to be more interesting than I could ever have imagined: snot is not only a very active guardian of our airways and an essential part of our immune system, it could also be used instead of urine or blood to painlessly diagnose everything from pregnancy to cancer to multiple sclerosis to diabetes.
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