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Billy Bragg, the Sherpa of Heartbreak

Billy Bragg, the Sherpa of Heartbreak

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High Court: Police Can Collect DNA For Serious Crime Arrests

High Court: Police Can Collect DNA For Serious Crime Arrests

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Frank Lautenberg, Senate's Last WWII Veteran, a 'Fighter'

Frank Lautenberg, Senate's Last WWII Veteran, a 'Fighter'

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Trial Begins for Bradley Manning Over Leaked Documents

Trial Begins for Bradley Manning Over Leaked Documents

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Hezbollah's Role in the Bloody Syrian War Comes at a Price

Hezbollah's Role in the Bloody Syrian War Comes at a Price

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Spread of Protests Underline Social Divisions in Turkey

Spread of Protests Underline Social Divisions in Turkey

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Obama Moves to Fill U.S. Court of Appeals Seats

Obama Moves to Fill U.S. Court of Appeals Seats

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News Wrap: Conservative Groups Speak Out On IRS

News Wrap: Conservative Groups Speak Out On IRS

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Top Brass Reject Overhauling Military Justice System

Top Brass Reject Overhauling Military Justice System

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Challenges Facing Extreme Weather Researchers

Challenges Facing Extreme Weather Researchers

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Former Reagan Budget Director Argues Against Bailouts

Former Reagan Budget Director Argues Against Bailouts

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Krugman: "Economics Is Not a Morality Play"

Krugman: "Economics Is Not a Morality Play"

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PBS News Hour

See the Difference Between Pipe and Pressure Cooker Bombs

In this web exclusive scene, science correspondent Miles O'Brien explains the difference between pipe bombs and pressure cooker bombs, like the ones used at the 2013 Boston Marathon. Pipe bombs are much smaller so the pipe itself is the shrapnel. Less space means more pressure, and their size makes them easier to conceal.
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