Chuck Yeager broke the speed of sound on October 14, 1947. Joseph Kittinger broke the speed of sound on August 16, 1960. Chuck Yeager was in a plane. Joe Kittinger was free-falling.
Joe Kittinger jumped at a height of over 100,000 feet (Mt. Everest is only 29,029 feet), and fell for over four minutes. He attained a speed of 614 MPH. This and other feats attained from this jump have never been eclipsed.
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