A Conversation for Science Fiction - Some Hard, Some Soft
Mohs Scale of SciFi Hardness
Apollyon - Grammar Fascist Started conversation Jan 6, 2008
TVTW has a discussion of this same subject matter.
http://tvtropes.org/pmwiki/pmwiki.php/Main/MohsScaleOfSciFiHardness
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Mohs Scale of SciFi Hardness
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