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Dr. John Paul Stapp was not only the "fastest human on earth;" he was the quickest to stop. In 1954, America's original Rocketman attained a then-world record land speed of 632 mph, going from a standstill to a speed faster than a .45 bullet in five seconds on an especially-designed rocket sled, and then screeched to a dead stop in 1.4 seconds, sustaining more than 40g's of thrust, all in the interest of safety.

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13y ago

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