(urth) Sundial with "multitudinous faces"?

James Wynn crushtv at gmail.com
Fri May 13 12:56:02 PDT 2011


> 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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