(DIR) xkcd - A Webcomic of Romance, Sarcasm, Math and Language.
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       xkcd - A Webcomic - Sky Color (1145)
        
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       Feynman recounted another good one upperclassmen would use on
       freshmen physics students: When you look at words in a mirror,
       how come they're reversed left to right but not top to bottom?
       What's special about the horizontal axis?
        
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