Why is pee yellow?

Moment of Um - A podcast by American Public Media

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Pee is super cool! It’s 95% water. It’s sterile. And it can be a window into our overall health. But why is it yellow? We asked mechanical engineer Patricia Yang to help us find the answer.Got a Moment of Um question? Send it to us at BrainsOn.org/contact, and we’ll help find the answer.