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Well, we've really only settled the question of ghosts that emit or reflect visible light. Or move objects around. Or make any kind of sound. But that covers all the ones that appear in Ghostbusters, so I think we're good.

"Settled", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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Well, we've really only settled the question of ghosts that emit or reflect visible light. Or move objects around. Or make any kind of sound. But that covers all the ones that appear in Ghostbusters, so I think we're good.


Page last modified: 7/8/2013.