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Lori Baker uses DNA samples to track down the loved ones of immigrants who died on their journeys. "I would love not to do this anymore, but I don't think I have it in me not to," she says.

Ever wondered who the big greenhouse-gas emitters are in your neck of the woods? The answer is now just a click away.

People and other primates have an amazing ability to instantly recognize faces. Scientists at Caltech found that we do that by having 205 specialized brain cells divvy up the task.

This past week, the Justice Department announced changes to clemency criteria for federal prisoners. The changes will allow more prisoners who are locked up on nonviolent drug charges to petition for early release. NPR's Eric Westervelt speaks with Vanita Gupta of the American Civil Liberties Union.

In 2007, Missouri repealed a law requiring gun buyers to obtain a license demonstrating they'd first passed a background check. In the years that followed, the Johns Hopkins Center for Gun Policy and Research tracked the results. In the forthcoming issue of Journal of Urban Health, the center will release it's findings: The law's repeal was associated with an additional 55 to 63 murders per year in Missouri between 2008 and 2012. For more on the report, Audie Cornish speaks with Daniel Webster, the director of the center.

Currently, the site uses face recognition to prompt users to tag themselves or their friends in photos. Now users will get alerts when a photo is posted of their face, tag or no tag.

New state laws requiring voters to show identification before casting a ballot have been hotly debated during this election season. Now the civil rights group, the NAACP, is appealing to the United Nations Human Rights Council for support. Host Michel Martin talks with the group's Hillary Shelton.

Investigators say they're confident only one gunman was responsible for the deaths of 12 people and wounding of others. The man who authorities say carried out the attack, 34-year-old Aaron Alexis, is also dead after a gun battle with police.

Sunil Tripathi had nothing to with the Boston bombings. He'd actually been missing for a month. But a New York Post front page led to wild speculation on the Web, and for a day or so, he was being called a suspect by some on social media.

Andrew Pochter, 21, was from Chevy Chase, Md. He was in Egypt to teach English to children. It appears he was attacked on Friday while watching an anti-government protest in Alexandria.