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A mouse's brain clears out toxins during periods of deep sleep — including toxins that form the sticky plaques associated with Alzheimer's disease. Could the same hold true for people?

The kingdom's execution of Sheikh Nimr al-Nimr, who was highly critical of the Saudi government, marks a turning point in Saudi-Iranian relations and has sent shock waves through the region.

A natural wonder 60 miles from Portland has never been documented until now. It's a deep and narrow slot canyon. There are concerns a lot of adventure-seekers from all over will show up to explore it.

Laws take effect this week aimed at curbing Italy's love of smoking. Smokers who flick butts on the street, risk a $300 fine. Mary Louise Kelly talks to Salvatore Barberi a tour guide in Rome.

Martin Shkreli is to appear before a House panel Thursday for a hearing on drug prices. Shkreli's company purchased the life-saving drug Daraprim, and then raised the price by 5,000 percent.

The Noor I solar thermal power plant is the first phase of a project that's projected to provide more than a million Moroccans with electricity — even once the sun has gone down.

There's a little-known island that serves as a cemetery for the homeless, stillborn babies and unclaimed remains. But visiting the island is a challenge — even for families of the deceased.

It's reassuring for parents and grandparents far away from their little loved ones, but what do babies get out of it?

Court-appointed lawyers say they are too understaffed and underfunded to handle the city's indigent caseload, so there's now a waiting list for felony suspects who can't afford their own lawyer.

Florida Sen. Marco Rubio is drawing big crowds in New Hampshire, where he's not just eyeing Donald Trump and Ted Cruz, but also hoping to wrap up after a strong showing in Iowa.