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Space Cadet by Robert Heinlein:
Science Fiction Inventions, Technology and Ideas
This Heinlein juvenile - a novel written particularly for the 12+ crowd - is dated but still a good story. The Space Cadets are the guardians of the solar system; only the best of the best are accepted. And how often do you get to prove yourself on Venus? Select
an invention:
Gravity Centrifuge Used in low gravity environments to build up muscle for visits to Earth, or other high gravity worlds.
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