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Old 05-21-2008   #7 (permalink)
Tamlin
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Join Date: May 2006
Location: Sitting in the Wishing Chair
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Well, I'm no physicist but I wonder if it could be the effect of differing light wavelengths over a distance? Red light is at the long-wavelength end of the spectrum, while blue and violet are at the short end. That's the only explanation I can think of (and it's probably not a very good one).
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