DIR xkcd - A Webcomic of Romance, Sarcasm, Math and Language.
   DIR Floodgap Gopher Fun and Games
        
       xkcd - A Webcomic - Average Familiarity (2501)
        
       Image:
       average_familiarity.png
        
       How could anyone consider themselves a well-rounded adult without
       a basic understanding of silicate geochemistry? Silicates are
       everywhere! It's hard to throw a rock without throwing one!
        
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