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Artificial Intelligence (1602) Astrophysics (67) Cryonics (63)

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	Dyson Spheres - http://users.rcn.com/jasp.javanet/dyson/index.html Some sketches of dyson spheres.
	Time Travel Message Board - http://www.network54.com/Hide/Forum/thread?forumid=185348&messageid=1015003839 Discuss the philosophical and physical ramifications of time travel, paradoxes, parallel universes, and related topics.
	Ultimate Biospheres - http://www.seds.org/archive/nodes/NODEv4n3-10.html An explanation of the concept of the Dyson sphere.

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