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Engineers have developed a low-cost material that efficiently sterilizes and desalinates water using only solar energy. The secret to the new technology is likely sitting right on your desk.

In the wake of violent clashes between protesters and police in Ferguson, Mo., President Obama is ordering a review of the federal programs that help local police departments purchase military gear.

The top two presidential candidates in Afghanistan shake hands and sign a power-sharing deal, ending months of bitter disputes over who will succeed Hamid Karzai.

British police say they are treating an explosion on the London Underground as terror-related.

In Texas, every statewide elected official is Republican and the GOP controls the legislature. But efforts to restrict bathroom access for transgender people show a party that's far from united.

A poll found that 38 economists agree the GOP tax plan will not pay for itself through growth. In fact, they're doubtful that growth will happen anyway.

Republican leaders expressed confidence that the measure could pass the Senate. It is likely to face even fewer hurdles in the House, as the GOP aims to pass a tax bill by Christmas.

China listed 106 items it could hit with tariffs, this time including America's biggest export to the country: soybeans.

Russian influence-mongers appear to have created a number of fake local news Twitter accounts — and spent years posting real headlines.

Before a meeting with GOP lawmakers Tuesday, the president told reporters he misspoke in Helsinki: When he said he saw no reason why it "would" be Russia that interfered, he meant to say "wouldn't."