DIR xkcd - A Webcomic of Romance, Sarcasm, Math and Language.
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       xkcd - A Webcomic - Star Lore (1973)
        
       Image:
       star_lore.png
        
       That one is a variable star which pulses every 30 seconds. Its
       name comes from a Greek word meaning "smoke alarm."
        
       Comics reproduced from www.xkcd.com under license.
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