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Older people with low levels of vitamin D are likely to lose memory and executive function more quickly, a study finds. But it didn't look into whether taking supplements could help.

The game's concept and graphics were simple. The gameplay was habit-forming. And Nintendo's mustachioed, overalls-wearing plumber Mario became a global icon.

The Jewish Democratic presidential candidate admitted differences with his conservative Christian audience at Liberty University, but called for civil discourse on social justice and morality issues.

Two decades ago, a prisoner serving a life sentence had an idea of a college course. This year, over 100 universities and colleges will be offering a class just like the one he envisioned.

A deputy county coroner tells NPR that professor Eric Schmidt was shot in the head. Lamb is also a suspect in a woman's death.

The U.N. refugee agency has received less than half the $4.5 billion needed to help Syrians who have fled to neighboring countries. As conditions worsen, many are opting to risk the journey to Europe.

Pope Francis is set to visit a Catholic school in New York City that used to have a sponsoring church. The parish was closed in 2007 in a region that has been a traditional Catholic stronghold.

A Charleston, S.C., judge ruled that Michael Slager will have to remain in jail. Slager, then an officer, was caught on video, shooting Walter Scott in the back during a traffic stop in April.

When Republican candidates take the debate stage later this week, their social media teams will also be tweeting up a storm. NPR looks at social media on the trail.

Almost every state bought new computerized voting equipment after the disputed 2000 election. But the machines are coming to the end of their useful lives, and there's little momentum to replace them.