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Mars used to be much warmer and wetter than it is today. Scientists are unraveling the mystery of why it dried out.

The U.S. trade representative has released the full text of the Trans-Pacific Partnership, a trade deal more than 6,000 pages long. The 12-nation TPP would cover the world's largest free trade area.

Oscar-nominated screenwriter Melissa Mathison has died at the age of 65. NPR's Mandalit del Barco offers a remembrance of the woman who wrote E.T. the Extra-Terrestrial, among other films.

NPR's Kelly McEvers speaks with Najmaldin Karim, governor of Iraq's Kirkuk province, about the Kurdish forces' continued struggle against ISIS.

One of my favorite features of winter is being able to see bird nests in leafless trees. I like to figure out what species lives in a particular area so I…

Brazil says it has greatly reduced the rate of deforestation. That may be true, critics say, but they argue such figures are misleading because so much of the Amazon has already been degraded.

Close to a million college kids use Piazza. Pooja Sankar, the apps' creator, says her company can't solve all the problems for women in computer science but she hopes it's making a difference.

The new movie Spotlight is about the team of investigative reporters at the Boston Globe that broke the story of sexual abuse in Boston's Catholic Archdiocese.

British investigators tell the BBC that they "believe a bomb was put in the hold prior to take-off," the news agency reports.

The unemployment rate dipped slightly to 5 percent, according to the report from the Bureau of Labor Statistics.