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Urban farmers are eyeing rooftops that are already green as potential sites to grow food. But there are big obstacles to rooftop farming — from permitting to transporting water and soil to the top of a building.

Not only are Brazilian artists now getting big play in major museums around the world, but something new is happening inside Brazil: There's a burgeoning appetite for art.

Tlacoyos are a doughy corn tortilla of sorts that's cooked on a grill. Whether enjoyed on a plastic plate as street food or fine china in a high-end restaurant, it's been a favorite snack for centuries.

Our Peace Corps correspondent meets the giant ball of carbs that floats in many a Ghanaian stew. She takes a pinch (using her right hand only). And she learns to almost love it.

A top EPA official resigned Thursday over the handling of the ongoing water contamination crisis in Flint, Mich. The role of the EPA and whether the federal agency should have done more has been a recurring theme in White House discussions this week.

Alex Honnold has scaled the sheer face of Half Dome in Yosemite, Calif., without the aid of ropes — and entirely alone. Still, he says his big break didn't arrive until a TV producer approached him.

The chytrid fungus has wiped out populations of amphibians around the world. A type of the fungus infects only salamanders, and researchers have identified vulnerable areas in North America.

American adults play more golf than any other sport. So how much exercise do you get from an afternoon on the links? Players clipped on pedometers and Fitbits to help us find out.

From South Carolina to Mississippi, there have been calls to remove the flag that many people call divisive. Businesses, too, are getting in on the act.

The renowned Spanish museum has made 3-D copies of some of its most iconic works to allow blind people to feel them.