(DIR) xkcd - A Webcomic of Romance, Sarcasm, Math and Language.
 (DIR) Floodgap Gopher Fun and Games
        
       xkcd - A Webcomic - Marble Run (2785)
        
       Image:
 (PNG) marble_run.png
        
       I have so many plans. It would incorporate a Galton board, a
       Ranque-Hilsch marble vortex tube, and a compartment lined with
       pinball bouncers with a camera-and-servo Maxwell's Demon that
       separated the balls into fast and slow sides.
        
       Comics reproduced from www.xkcd.com under license.
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