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The human brain definitely differs from the brains of our primate relatives. But how did we get such big brains? A paper in the journal Nature says part of the answer may lie in a snippet of DNA buried deep in the human genome.

Refugee camps in Sudan's Darfur region are underfunded and desperately in need of supplies. Carlos Veloso, The World Food Program's Emergency Coordinator for the region, talks with Renee Montagne about camp life.

Elvia Bautista was devastated when her younger brother was killed in a gang shooting. Now, she believes in remembering all the victims of gang violence even when doing so may endanger her own safety.

For Paul Simon, the songwriting process often proceeds "backward." The singer-songwriter explains what that means — and how it affects his new Surprise, a collaboration with electronic-music pioneer Brian Eno.

After leaving for better-paying jobs in the United States, migrants from the Mexican town of Malinalco find themselves missing their families and communities back home.

President Bush names Air Force Gen. Michael Hayden to replace Porter Goss as director of the CIA, touching off what may be a tough confirmation battle. Several members of Congress have criticized a controversial eavesdropping program that Hayden ran as director of the National Security Agency.

Illegal border crossings are up in the San Diego area, even though a large National Guard contingent is providing support for the U.S. Border Patrol. Experts say beefed-up enforcement in Arizona and New Mexico is pushing illegal crossers toward California.

When five foreign students from Egypt didn't show up for a month-long course at a Montana university, a web-based tracking system went into action. The system had been created in 2001. A manhunt ensued and the missing students were located within a matter of days. It turns out they had come to find jobs, not to study.

For years there has been controversy over how many Vietnam veterans suffer from post-traumatic stress disorder -- a psychiatric condition that can result from experiencing a terrifying danger. Using combat records for the first time, a landmark study in the journal Science comes up with a number lower than the onetime estimate of 30 percent but still significant: close to 20 percent.

A former contractor for the CIA is found guilty on four counts related to the beating death of a prisoner in Afghanistan. David Passaro is the first American civilian convicted of prisoner abuse in the Middle East. A onetime Green Beret medic, Passaro could face up to 11 1/2 years in prison when sentencing takes place later this year.