Sundial with "multitudinous faces"?

James Wynn · 13 May 2011, 19:56 · from 2011-May.txt.gz

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From: crushtv at gmail.com (James Wynn)
Date: Fri, 13 May 2011 14:56:02 -0500
Subject: (urth) Sundial with "multitudinous faces"?
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> If I recall correctly the spoiler for Tipler cylinders was Hawking's
> proof that it would require negative energy in some areas of the local
> spacetime.

Yeah. And if we had negative energy and negative mass, we'd probably be 
going backwards in Time anyway.

J.

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