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Agents at the Bureau of Alcohol, Tobacco, Firearms and Explosives have spent months testing new plastic weapons, and report that the guns can be lethal and hard to detect. The findings come just as a federal law that requires guns to be composed of at least some metal to help people in schools and airports detect them is set to expire.

Renewable energy has become a $220 billion a year industry. But to significantly slow climate change, the power of wind, solar and other renewable sources must vastly expand. Some say the tech breakthroughs needed are on the horizon, though a top economist sees a tougher road ahead.

Prompted by calls for violence on the radio, South Sudanese rebels have slaughtered hundreds of civilians. Melissa Block speaks with UN representative in South Sudan, Toby Lanzer.

In Tuesday's Senate GOP primary, there's little ideological difference between the top candidates, and no one can lay exclusive claim to Tea Party support.

Some analysts say that Nintendo's days are numbered because sales of its new console, Wii U, have been lackluster. But since Nintendo still offers some of the most popular game franchises, the love of Zelda and Mario may keep the company going for a long time.

In Vancouver four years ago, athletes who grew up in the Adirondack Mountains in upstate New York accounted for about 1 in 10 medals won by the U.S. In this region, the Olympics don't seem like a pipe dream, and they don't seem like ancient history — they're just sort of what people do.

Anti-government activists in Ukraine plan another big demonstration in the capital of Kiev on Sunday — the first major protest since the government introduced new restrictive laws aimed at curbing the protests. NPR's Corey Flintoff talks to NPR's Rachel Martin from the streets of Kiev, where violence has mounted in recent days.

Architects have come up with spectacular concepts for vertical farms that would grow crops in city skyscrapers. But many horticulturists think the future of vertical farming isn't in skyscrapers, but rather in large, indoor warehouses lit up magenta by superefficient LEDs.

The Ohio Republican will again hold the top post in the House. He challenged House members Thursday to come to their jobs humbled. "If you have come here to see your name in lights or to pass off political victory as some accomplishment, you have come to the wrong place," Boehner said.

In fashion's first hackathon, developers had just 24 hours to build an app for the industry — the finalists will be presented on the runway at New York's Fashion Week. "Right now the industry could really use some innovation," says Decoded Fashion founder Liz Bacelar.