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From Killeen, Texas, where Fort Hood is based, Melissa Block talks to soldiers who were on base during the shooting, as well as with Killeen's mayor. The mayor explains how the town is trying to cope.

Since 2001, more than 100,000 troops have left the military with an other-than-honorable discharge. The "bad paper" puts benefits and medical care out of reach, even for those who served in combat. Which raises a simple question: What does America owe those who serve?

Brothers Mark Fainaru-Wada and Steve Fainaru take an exhaustive look at how the NFL has dealt with allegations that playing football can lead to brain damage. They say the NFL has repeatedly avoided tying football to brain injury, even as it has given disability payments to former players with dementia-related conditions.

The first fissures witnessed in 2011 have blown wide open, and the country has morphed into the Wild West. One activist who returned to Libya to support the revolution, says the dreams of a new Libya are at risk.

During China's Cultural Revolution, communist youth known as Red Guards persecuted, tortured and killed millions of Chinese — so-called class enemies. Now some Red Guards are apologizing publicly in rare examples of open discussion of the party's historic mistakes.

Five weeks after hundreds of Nigerian school girls were abducted by the extremist group Boko Haram, bomb blasts have hit two cities. Journalist Chika Oduah gives an update on the volatile situation.

Gays often lack the kind of support from adult children or other family members that prevents people from sliding into homelessness. In San Francisco, they are twice as likely to be homeless as straights, indicative of a problem in major cities nationwide.

For years, the Army has effectively ignored the ban against women in combat, though it's still hard for them to receive full recognition for what they've achieved. "Battle-fatigued female soldiers" is a new and uneasy concept for American society.

A computer-simulated woman named Ellie is designed to talk to people who are struggling emotionally and take their measure — 30 times per second. Researchers hope their technology, which reads a person's body language and inflections, will yield diagnostic clues for clinical therapists.

After becoming homeless and jobless following her transition to being a woman, Ruby Corado got her act together, and now helps others facing similar challenges. "We have a family here," she says.