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       xkcd - A Webcomic - Pendulum Types (2924)
        
       Image:
 (PNG) pendulum_types.png
        
       The creepy fingers that grow from a vibrating cornstarch-water
       mix can be modeled as a chain of inverted vertical pendulums
       (DOI:10.1039/c4sm00265b) and are believed to be the fingers of
       Maxwell's Demon trying to push through into our universe.
        
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