DIR xkcd - A Webcomic of Romance, Sarcasm, Math and Language.
   DIR Floodgap Gopher Fun and Games
        
       xkcd - A Webcomic - Scenario 4 (2289)
        
       Image:
       scenario_4.png
        
       Remember, models aren't for telling you facts, they're for
       exploring dynamics. This model apparently explores time travel.
        
       Comics reproduced from www.xkcd.com under license.
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