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If life did arise on Mars, the trek to Earth might not have been that difficult. Modern tests have shown that microbes could survive such a journey on a meteorite, says guest blogger Bill Mesler.

Puerto Rican leaders gathered in Orlando, Fla., in an effort to begin building the political clout of the nation's second-largest Hispanic group.

U.S. economist Michael Pettis, an expert on China's economy and professor at Beijing University, is also a key figure nurturing a distinct American sound in Beijing's avant-garde music scene.

The U.S. military gave no details about the Thursday airstrikes they say killed Sanafi al-Nasr. The Pentagon said he was "a longtime jihadist experienced in funneling money and fighters for al-Qaida."

High fees are eroding the retirement savings of millions of Americans, but employers who shop around can find better options for their 401(k) plans. A small Minnesota firm offers a dramatic example.

Many groups are battling for control of Syria's second largest city. The Free Syrian Army has its main headquarters here. Middle East analyst Andrew Tabler explains the strategic importance of Aleppo.

Congress returns this week and Republicans will take up the unresolved matter Speaker John Boehner's successor. And Hillary Clinton will go before the House Benghazi Committee. Cokie Roberts explains.

Last year, public health officials were taken by surprise when new strains of the flu virus appeared. Not so this year and they advise everyone six months or older to get vaccinated against the flu.

The pet kangaroo — spotted bouncing around near an auto repair shop — escaped though an unlocked gate at a nearby home. Pet kangaroos are illegal in New York City, but Buster may have been a guest.

NPR's Audie Cornish talks to Joel Dvoskin, a clinical and forensic psychologist who is a consultant to psychiatric hospitals around the country, on how to reduce the risk of assaults. He says no hospitals have been able to completely eliminate the risks, but there have been successes in reducing the number of assaults. He explains the key elements for reducing risk.