Submitted: May 8, 2008 - Roller coasters are getting bigger and bigger, and scarier and scarier. What would happen to you if your safety harness broke on one of these giant, speedy rides? Maybe nothing.

A roller coaster loop-the-loop is a sort of centrifuge. As you approach the loop, your velocity is straight ahead of you. But the track keeps the coaster car, and therefore your body, from traveling along this straight…