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Astronauts discovered an ammonia leak in a system designed to keep the International Space Station's power supply cool.

Women on the Senate and House Armed Services committees are leveraging their clout in response to the problem of sexual assaults in the military.

To know how elephants are faring, they need to be counted. But how do you count them when they're hidden under thick forest canopies? A conservationist in the 1980s started to count their poop, and that helped to create a model of elephants' numbers and movement through the forest.

Automatic budget cuts have pushed Air Force bases to slash their flying budgets even though it means grounding pilots and reducing readiness. The cancellations are boosting the arguments of those who want the military excepted from sequestration cuts.

The extensive coverage of Nelson Mandela's fading health has sparked intense debate in South Africa. Many say the African way views the twilight years as a final journey, a time of peace and respect, and that journalists should be more sensitive.

Longtime blues joint Gip's Place, in Bessemer, Ala., has been forced to close its doors. Weekend Edition profiled the place two years ago. Host Scott Simon takes note of the closing.

Secretary of State John Kerry has been in office for less than three months and as he travels the globe, his priorities are becoming clearer. He's trying to find a diplomatic solution to the Syrian crisis, revive Israeli Palestinian talks and convince China to use its influence with North Korea to resolve that issue diplomatically.

Also: IRS's actions add to conservatives' case against Obama; Pakistanis go to polls after campaign marred by violence; astronauts prepared for spacewalk to station's leaks; survivor of Bangladesh building collapse said to be "doing great."

Efrain Rios Montt was found guilty of ordering more than 1,700 people's deaths. His conviction is a boost for those who push for respect for human rights in the region.

There's a move in Congress to name a science laureate. Astronomer Mike Brown hopes that person would do much more than visit schools to encourage kids to consider careers in science. He'd like to see a laureate reach out to the public in all sorts of ways.