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  1. Joshua Judson Rosen (rozzin)'s status on Thursday, 26-Dec-2013 23:09:33 EST Joshua Judson Rosen Joshua Judson Rosen
    "Shrinking Heads & Sharper Sundials": fun with penumbrae, and just exactly how daytime shadows work http://www.atoptics.co.uk/fz317.htm
    Thursday, 26-Dec-2013 23:09:33 EST from web permalink

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