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Space Future
Space Future is for everyone who'd like to visit space. Features include the archive of space tourism work, information on vehicles, tourism and power plus mailing lists and the Space Future Journal.
http://www.spacefuture.com.
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HotAIR
Rare and well-done tidbits from the Annals of Improbable Research.
http://www.improb.com
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Foresight Institute
The Foresight Institute's goal is to guide emerging technologies (especially nanotechnology) to improve the human condition.
