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Negative absolute temperature
#1
I read wikipedia's article on Negative Absolute Temperature.  It has to do with the level of entropy decreasing after a certain point.  I thought the concept was bizarre and freaky enough for Orions Arm.  It does happen in things like lasers; I wondered if this is worth pursuing here.  What new uses would archailects find for it?  

https://en.wikipedia.org/wiki/Negative_temperature
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#2
Interesting idea. Negative temperature systems are ones where entropy decreases as energy is added. Are there situations, perhaps high energy plasmas, where decreased entropy is useful?
Mike Miller, Materials Engineer
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"Everbody's always in favor of saving Hitler's brain, but when you put it in the body of a great white shark, oh, suddenly you've gone too far." -- Professor Farnsworth, Futurama
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