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http://www.polarization.com/haidinger/haidinger.html

* Or at least, allegedly. I've just spent several minutes staring at a piece of paper without seeing anything; but I was pointed at this site from that of a professor of physics at MIT, so it's unlikely to be a hoax. Also, the site does say it's best to practice with fully polarised light; and I don't have a polariser.

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Lethargic Man (anag.)

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