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

itoggle caption Paul Sakuma/AP

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

itoggle caption 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

itoggle caption Courtesy of AquaBounty Technologies