June 17, 2002
CNN: Amusement parks put science into screams

CNN: Amusement parks put science into screams

"Long before roller coasters launch their riders through cobra rolls, hair-raising twists and corkscrews, many must pass the "Fred" test. That's the name of a crash-test dummy wired with sensors that measures the forces roller coasters put on people's heads and necks."

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