In dozens of military and civilian laboratories across the U.S., researchers are working under pressure to perfect ways of keeping a human being alive and functioning efficiently when he soars into the void of space (TIME, May 26). None of their problems is as will-o'-the-wispy as weightlessness, the gravity-free state that will envelop man when he orbits around the earth or reaches for the moon and planets. Reason: in the earth's atmosphere and gravity belt, this unearthly state can be created only for a fraction of a minute at a time. To learn...

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