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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.

Other countries provide formal training for people who want to be national leaders. Why not the U.S.?

In a survey of 96 countries on how their over-60 citizens fare, some rankings were completely predictable: Norway was first and Afghanistan was last. In between, there are a number of surprises.

It's rivalry week in college football. And this weekend, there's some extra spice as games from Alabama to Florida to Michigan could have an impact on which two teams end up playing for the national championship.

Previous estimates of the climate-warming gas were based on the rough number of methane-emitting sources on the ground — such as factories, refineries, stoves, swamps, landfills and cattle herds. But by directly measuring levels of methane in the air instead, a new study puts the total much higher.

To recapture its old glow, Yahoo poached Google's highest-ranking woman, Marissa Mayer, in 2012. Carlos Watson, co-founder of Ozy.com, talks with NPR's Arun Rath about how Mayer has shaped the company since she took the job.

Medicare reimbursed the university where I work $45,994 for my services in 2012. What did I do to earn the money, and how do I stack up against other doctors?

The Major League Baseball regular season began last week in Sydney, Australia. As sportswriter Stefan Fatsis explains, it resumes with one game on Sunday and a full slate on Monday.

In a dispute between the University of Texas president and Gov. Rick Perry, the governor may have lost the battle — but he may yet win the higher education reform war.

NATO officials are warning about a sizable troop buildup by Russia along its border with Ukraine. NATO's top commander says the large numbers demonstrate that Russia is acting like an adversary.