See the Difference Between Pipe Bombs 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...

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Pipe bombsadd a new dimension to the threat. We asked Van Romeroof New Mexico Tech University about that. In a device like this, you don't haveenough roomto pack it with shrapnel, so the pipe itselfis the shrapnel.While a pressure cooker bomb is packed with shrapnel,in a pipe bomb there's not enough space.The pipe itself, is the shrapnel.lBut less space means more pressure. Its smaller,so there's less gun powder there, but it does a better job of confiningthe pressure. In a Pipe bomb, pressures can build up a little bit higherand create higher velocity. "Stand by, charged"The best view is up close with the high speed camera.[Explosion] This big piece,look how that tumbles as it comes out. That really islethal.The slow-moti...