The Vertical Frontier
NATURE designed man's body for a groundling's life, never more than treetop height above the earth's surface. In the upper reaches of the atmosphere or in the airless space beyond, man is as much out of his element as a mackerel marching across the Sahara. But unlike the mackerel, man is determined to transcend his environment. He reaches for the stars. A short half-century after the Wright brothers skittered over the sand dunes of Kitty Hawk aircraft now on the designers' boards will fly at heights of 100,000 to 125,000 ft....
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