PBS NewsHour

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WASHINGTON — President Barack Obama authorized U.S. airstrikes in northern Iraq Thursday night, warning they would be launched if needed to defend Americans from advancing Islamic militants and protect civilians under siege. His announcement...
Certified nurse practitioner Myra Tilson conducts a check-up on a patient at a Community Clinic Inc. health center in Takoma Park, Maryland, U.S., on Tuesday, Oct. 1, 2013, the same day health insurance exchanges opened their doors across the nation...
Engineers are experimenting with new ways of harnessing the power of sun. If they can generate enough heat from sunlight, they can drive chemical reactions and create renewable fuels. Photo by Science Nation/National Science Foundation Many cities...
Photo by David Paul Morris/Getty Images In an effort to make the Internet a safer place, Google will prioritize secure websites in search results, giving a boost to those URLs with an “https” — “s” as in “secure...
Photo of Great Spring and Paradise Lake at Yellowstone National Park by Flickr user jamesbmore. What happens when a drone crashes into one of the world’s largest hot springs? The aircraft might potentially damage the spring, but trying to remove it...
In space, no one can hear you snore. Astronaut Mike Hopkins takes a spacewalk outside the ISS in December, 2013. Photo by NASA According to the longest sleep study ever conducted in space, astronauts’ use of sleeping pills, such as Ambien, is...