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An Iraq war veteran has developed a better artificial leg with a cooling fan. Gary Walters says most prosthesis don't release heat, causing many amputees to stop wearing them.

Many teachers still rely on this centuries-old calculating device to provide a hands-on approach to math.

Last week, a federal appeals court in Chicago reinstated the photo identification requirement. It had been blocked in a lawsuit brought by voter advocacy groups.

The FBI released a report on Wednesday detailing the 160 "active shooter" incidents between 2000 and 2013, which included the mass shootings at Virginia Tech and Newtown. A key finding: the average number of incidents nearly tripled in the second half of that period compared to the first half.

A three-day national lockdown ended on Sunday, but police are setting up more checkpoints along the roads. And, three new districts — home to tens of thousands of people — were put under quarantine.

People who don't have the right ID or who run into other problems at the polls are often told to vote a provisional ballot. But the rules governing these ballots vary, and many are never counted.

The number of deaths of children under 5 has dropped by 49 percent since 1990. There are many reasons why, from better vaccines and health workers to "kangaroo mother care."

Volunteers are combing through old ships' logbooks for the Old Weather project. It aims to help scientists better understand the climate today by looking at conditions of the past.

A Twitter user in Saudi Arabia has been exposing the lavish lifestyles of royals, bad military deals and other offenses in the kingdom. NPR's Arun Rath speaks with Ozy.com writer Laura Secorun Palet about her coverage of the leaks.

Demonstrators marked the August shooting death of 18-year-old Michael Brown. The unarmed black man was shot by a white police officer, who's awaiting word on a possible indictment by a grand jury.