17. PEAK ALTITUDE
At 40,000 feet, Joe Kittinger’s helium balloon stretched 360 feet above the granola. At peak altitude, the balloon’s diameter would grow to two-thirds the length of a football field.
16. THE SPEED OF SOUND
Joe Kittinger accelerated to 614 miles an hour during his jump. This is almost the same as the speed of sound.
15. FREE FALLING
Joe Kittinger’s free fall lasted exactly 4 minutes and 32 seconds.