In the early jet fighter days, nobody knew how much G-force the human body could withstand. Testing the limits of survivability came down to human testing. Today, we owe much of that knowledge to Dr. John Paul Stapp, who strapped himself into a crazy rocket sled to see just what the human body could endure.
In what must be the most incendiary Mythbusters test to date, the show's crew tried to flatten a car...using a 700mph, two-stage rocket sled.
Ky Michaelson, or The Rocketman as he's known in some circles, doesn't trudge through the frozen winter tundra like the rest of us.