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Science Fiction
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"[Science fiction is ] That branch of literature which is concerned with the impact of scientific advance upon human beings."
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As presented by Heinlein, this device does not appear to be a fully automated sentry gun that detects intruders in a wide area. It works on a simpler sensor, like an electric eye beam. If you break the beam, the gun fires.
Compare to the blaster from When the Green Star Waned (1925) by Nictzin Dyalhis, the neutron disruption blaster from The Complete Paratime (1951) by H. Beam Piper and the meteor blasters from First Contact (1945), by Murray Leinster. Comment/Join this discussion ( 0 ) | RSS/XML | Blog This | Additional
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