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The third time's the charm.That's the view of a new super PAC that wants former Gov. Rick Perry to re-enter the 2016 presidential race — the same one he…

NASA is building a 2-pound helicopter drone that would help guide the vehicle on the Red Planet's surface. That way, the rover wouldn't need to wander as much to find its way around.

An Arizona school district slimmed down its budget by dropping class on Fridays. But parents say they're having to stretch their wallets to find something for their kids to do on that fifth day.

Coal is king in India. Some say there's little alternative. So how can this country, the world's third-largest polluter, provide energy and lift millions from poverty while trying to become "greener"?

Scientists worldwide face a yearly challenge in deciding what goes into the annual flu vaccine to make it effective. The job requires keeping tabs on a massive group of speedy, shape-shifting viruses.

An NPR poll finds nearly two-thirds of adults got this year's flu vaccine or plan to get it. Many of those who are skipping vaccination cite a lack of need and worries about side effects.

Steve Inskeep continues his conversation with Itzhak Perlman, who was 13 when he performed on The Ed Sullivan Show in 1958. When he was four, Perlman contracted polio and has used crutches since.

Heads of state are in Paris to attend the opening of the U.N. climate change conference on Monday. It's a huge security challenge for a city still reeling from the Nov. 13 terrorist attacks.

The conference is being billed as a last-chance summit to avoid catastrophic climate change. The goal is to come to a global agreement to limit greenhouse emissions.

Leaders from around the world are converging on Paris for the 2015 U.N. Climate Change Conference. Listen to our special coverage to find out what you should know and what's at stake.