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Cheap Perpetual Calendar

MAKE Magazine found this 12/31/2008 on evilmadscientist.com

A quick, handy, geeky, and seriously inexpensive perpetual calendar for your desk. Got 12 cents and a scrap of cardboard? You're good to go! Cut twelve slits, stick in your pennies, and... here it is, all built: At first glance, this is about as sensical as one of those crazy ...