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Universalpsykopath tugs our coat and says: Tell us about your feats of deduction and the little mysteries you've solved. Alternatively, tell us about the simple, everyday things that mystified you for far too long.

(, Thu 13 Oct 2011, 12:52)
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it was also how they "healed" the lepers in the 1920s film about Jesus...
Red and Blue being indistinguishable on a B&W camera, they made the "spots" on the lepers blue, then had a filter that was half-red and half-blue. Rotate from red-to-blue and the spots disappear as far as the camera is concerned. They did the same in reverse to do a Jekyll-to-Hyde transformation in front of the camera, too - clever stuff and the guy who did the effects kept it a secret until the day he died, just to keep the magic alive. Isn't physics great?
(, Mon 17 Oct 2011, 15:25, Reply)

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