See the Difference Between Pipe and Pressure Cooker Bombs

See the Difference Between Pipe Bomb and Pressure Cooker Bomb Explosions More

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.

AIR DATE 5/31/13