The Human Crash Test Dummy, Colonel John Stapp

This week, Elna picks Knoxville's brain on one of his heroes, Colonel John Stapp — the flight surgeon, biophysicist, and human performance scientist who once hit 639 miles-per-hour on a rocket sled and somehow lived to talk about it.   See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.