The junior space cadet may scream out in the night as he dreams man's ancient dream of falling through space, but he usually wakes up, at worst, on the floor, with nothing more than a slight bump. The real space traveler can count on no such happy ending. Space scientists believe that he will have to learn to live with a feeling of helpless falling while he flies through the stage of zero gravity. His nightmare will also include arms and legs that do not respond normally, and a sickening mental confusion about which way is up.
Physicists and biologists have recently...
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