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       xkcd - A Webcomic - 30 Days Hath September (1595)
        
       Image:
 (PNG) 30_days_hath_september.png
        
       There's a cool mental calculation hack I recently learned for
       this: If you open the calendar app on your phone or computer, the
       highest-numbered box along the bottom is equal to the number of
       days in the month!
        
       Comics reproduced from www.xkcd.com under license.
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