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There's been plenty of disagreement over whether stimulant drugs used to treat ADHD interfere with children's sleep. A review of studies finds the drugs make it harder to fall asleep and stay asleep.

During a papal visit, the media swarm and security is intense. He speaks of issues that face the country. After he goes, is there any lasting legacy?

Fourteen-year-old Lucas Etter unmixed a 3x3x3 Rubik's Cube in 4.904 seconds, setting a world record and becoming the first person to break the 5-second mark for solving the puzzle.

New York Times reporter C.J. Chivers discusses efforts by ISIS to weaponize a mysterious substance known as red mercury. "It's never been seen," he says. "It essentially is an urban legend."

The candidates made requests for equal time after Donald Trump guest hosted Saturday Night Live earlier this month. NBC will let them broadcast campaign messages on affiliate stations this weekend.

Researchers need to figure out how Ebola can — and can't — be spread by survivors. And health workers need to don protective equipment once again.

The Tunisian President declared a state of emergency for 30 days and an overnight curfew following the explosion that ripped through a bus carrying presidential security on a main road in Tunis.

Hillary Clinton, Marco Rubio and others are supporting the idea of a no-fly zone over Syria to try to help civilians there. But skeptics say it no longer has any relevance to today's Syrian crisis.

Thanksgiving is a holiday with a complicated history. So some teachers have developed strategies to teach it to young students.

The crate the birds were in fell off a truck in Wisconsin, and the duo made a break for it. It turns out they're a rare breed, so they'll spend the rest of their lives at a bird sanctuary.