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Twelve people are missing in Texas amid violent weather. More rain is in the forecast.

Nearly two years after his information about U.S. spying caused an international uproar, former NSA contract worker Edward Snowden spoke to an audience in London on Tuesday via live video feed.

Only women with more advanced cases of ductal carcinoma in situ benefited from surgery, a study found. Most women do have surgery for DCIS, although it's a controversial diagnosis.

Genes linked to inflammation are more active in winter, a study hints. That might partly explain why some diseases, including Type 1 diabetes and rheumatoid arthritis, are more likely to start then.

At a time when many are connected to hundreds, if not thousands, of people on social media, a company called the Front Porch Forum is building smaller networks.

Sharpen your Swiss Army knives and grab an extra roll of duct tape, because Mac may be coming back. The creators are looking to the fans to design the new show. And there's one big twist.

Tiny patches of Tanzanian farmland contain more rats than do nearby forests. These rats are more likely to carry the bacteria that cause the plague in humans.

The president, speaking at an event in Selma, Ala., to commemorate the march, said "our union is not yet perfect. But we are getting closer."

A video from NASA shows how air pollution moves around the world. So what happens when emissions from Asia blow across the Pacific Ocean to North America?

Scientists believe the project, which is reportedly underway already, could destroy a million acres of rainforest and contaminate Central America's largest source of drinking water.