(DIR) xkcd - A Webcomic of Romance, Sarcasm, Math and Language.
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       xkcd - A Webcomic - Seismic Waves (723)
        
       Image:
 (PNG) seismic_waves.png
        
       The USGS operates a really neat email/SMS earthquake notification
       service (earthquake.usgs.gov/ens/) that allows fine-grained
       control of notifications.
        
       Comics reproduced from www.xkcd.com under license.
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