arctoa [2013-05-02 08:34:17 +0000 UTC]
An impossible sense of geometry.
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davespertine In reply to arctoa [2013-05-02 22:42:12 +0000 UTC]
the universe would be impossible without mathematicians?
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NiraGonzalez [2012-03-09 10:49:15 +0000 UTC]