Pretty Sure I Can Fly with Johnny Knoxville & Elna Baker podcast

The Human Crash Test Dummy, Colonel John Stapp

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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.  

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