DIR xkcd - A Webcomic of Romance, Sarcasm, Math and Language.
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       xkcd - A Webcomic - Time Machine (716)
        
       Image:
       time_machine.png
        
       We never see any time travelers because they all discover it's a
       huge mistake. This is also why your friend at the lab suddenly
       looked about a year older recently.
        
       Comics reproduced from www.xkcd.com under license.
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