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There are clues about your activity level and metabolism in urine. Researchers hope to one day predict obesity risk by tracking the different levels and ratios of certain molecules in pee.

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Diamond Comic Distributors

Glen Weldon reviews the 50 comics available at participating comics shops for 2015's Free Comic Book Day, coming May 2 — what to pick up free, skip, and buy while you're in the shop.

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Skopein/Ikon Images/Getty Images

Sounds good, right? Add two minutes of walking to each hour of your day and your risk of death drops. Even walking to the coffee machine counts. But it's not enough to meet federal guidelines.

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Nina Feldman for NPR

Around Louisville, "derby pie" is de rigueur fare for the Kentucky Derby. But the pie's creators are real sticklers about what can be called a "derby pie" — and they're not afraid to sue over it.

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Daniel Acker/Bloomberg via Getty Images

Federal officials released prescription histories of hundreds of thousands of doctors and identified the most common and costly drugs. Medicare spent the most on a purple pill for heartburn.

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