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[i]In challenging the current speed record, Felix will attempt to become the first human to break the speed of sound in freefall, attaining Mach 1.0 (about 690 mph). In comparison, a skydiver falling in the standard, belly-down position reaches a top speed of about 120 mph. (Current record, established Aug. 16, 1960, and held by Col. Joseph Kittinger: 614 mph [equivalent to Mach 0.9])[/i]
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