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Home Sales Paint a Better Fiscal Picture in the U.S.

Home Sales Paint a Better Fiscal Picture in the U.S.

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Are Faces the New Fingerprints?

Are Faces the New Fingerprints?

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More Women As Family Breadwinners Reflects 'Values Shift'

More Women As Family Breadwinners Reflects 'Values Shift'

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Suspected Drone Strike Said to Have Killed Pakistan Taliban

Suspected Drone Strike Said to Have Killed Pakistan Taliban

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The Challenges of Securing the U.S.- Mexico Border

The Challenges of Securing the U.S.- Mexico Border

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Country Music Legend Dolly Parton's New Role: "Book Lady"

Country Music Legend Dolly Parton's New Role: "Book Lady"

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Ricin-Laced Letters Sent to and NYC Mayor and Advocacy Group

Ricin-Laced Letters Sent to and NYC Mayor and Advocacy Group

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A Mother and Daughter Portrait Of Long-Term Care

A Mother and Daughter Portrait Of Long-Term Care

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Chopra Brothers Talk How They Became Americans and Doctors

Chopra Brothers Talk How They Became Americans and Doctors

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Americans Still Struggling to Recover from the Recession

Americans Still Struggling to Recover from the Recession

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See the Difference Between Pipe and Pressure Cooker Bombs

See the Difference Between Pipe and Pressure Cooker Bombs

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How Police Use Robots to Investigate Bomb Threats

How Police Use Robots to Investigate Bomb Threats

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PBS News Hour

Understanding the Bombs Used at the Boston Marathon

NewsHour science correspondent Miles O'Brien visits the nation's most active explosives testing facility in New Mexico to learn more about what makes a pressure cooker bomb -- like those used at the Boston Marathon -- tick. Investigators often use the center to test theories and find new ways to defend against future attacks.