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There's a lot going on with the little blue pill called Truvada made by Gilead Sciences of Forest City, Calif. Paul Sakuma/AP hide caption

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Paul Sakuma/AP

Pill Cuts HIV Infection Risk Significantly, For A Price

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More airports are using backscatter scanners like this one at O'Hare International Airport. And that's making some people mad. Scott Olson/Getty Images hide caption

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Scott Olson/Getty Images

An AquAdvantage genetically engineered salmon behind a non-transgenic Atlantic salmon sibling of the same age. Courtesy of AquaBounty Technologies hide caption

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Courtesy of AquaBounty Technologies