Scientist Corey Gray and his mother, Sharon Yellowfly, are pictured at one of the two massive detectors that make up the Laser Interferometer Gravitational-Wave Observatory. One facility, where Gray works, is in Washington state, and the other is in Louisiana. Courtesy of Russell Barber hide caption
Smog fills Utah's Salt Lake Valley in January 2017. Winter weather in the area often traps air pollution that is bad for public health. George Frey/Getty Images hide caption
The sea squirt Ascidia sydneiensis, a tubelike animal that squirts water out of its body when alarmed, is one of 48 additional nonnative marine species in the Galapagos Islands documented in a newly published study. Previously, researchers knew of only five. Courtesy of Jim Carlton hide caption
Female mosquitoes searching for a meal of blood detect people partly by using a special olfactory receptor to home in on our sweat. Luis Robayo/AFP/Getty Images hide caption
Biased: Uncovering the Hidden Prejudice That Shapes What We See, Think, and Do, by Jennifer Eberhardt Viking hide caption
Edwin Hardeman sits with his wife, Mary, at a news conference after a San Francisco jury awarded him $80 million in damages over his claim that Roundup weedkiller caused his cancer. Jeff Chiu/AP hide caption
Just a 10 percent shift in the salt concentration of your blood would make you very sick. To keep that from happening, the body has developed a finely tuned physiological circuit that includes information about that and a beverage's saltiness, to know when to signal thirst. Nodar Chernishev/Getty Images hide caption
A female adult head louse holds onto human hairs, as it is filmed under a microscope. The brown line visible inside the louse, on the left side of its body, is the blood meal it took when it lived on a human host's scalp. Josh Cassidy/KQED hide caption
LED lightbulbs have replaced many incandescent ones. Now, the Trump administration wants to reverse an Obama-era rule designed to make a wide array of other lightbulbs more efficient. Mark Lennihan/AP hide caption
In March of 2017, the two sets of Bogotá twins, Jorge, William, Carlos and Wilber (left to right), gathered to celebrate Carlos's graduation. Diana Carolina/St. Martin's Press hide caption
Duke University is paying the U.S. $112.5 million to resolve allegations that it violated the False Claims Act by submitting falsified research data to win or keep federal grants. Here, a photo shows the Duke University Hospital in Durham, N.C., in 2008, when some of the fraud was alleged to have taken place. Chris Keane/Reuters hide caption
German ESA astronaut Alexander Gerst took this image of the Earth reflecting light from the sun while aboard the International Space Station July 17, 2014. Alexander Gerst/ESA/Getty Images hide caption
Simon Walker, a student at the Bern University of the Arts in Switzerland, checks a small music speaker placed directly below a wheel of Emmental. Fabrice Coffrini/AFP/Getty Images hide caption