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This incredible and rare documentary presented by the discovery channel and the smithsonian institute about the beautiful X-15... and the heroes who flew it... "199 flights where made for the X-15 program... for the space shuttle and for whatever winged vehicle may follow looking to fly across the threshold of space and back... its legacy is immense" (I don't own this video, its property is from the discovery channel... its presented as a legacy and educational purpose...)