Neatorama Posts Tagged "calendar math"
Friday the 13th is More Common Than You Think...

Nick Berry at Datagenetics says that the 13th day...  ...gman and Battleship, how to defeat a monster with math , and other useful stuff, so you know there’...

http://www.neatorama.com/2014/05/07/Friday-the-13th-is-More-Common-Than-You-Think/
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Check out Twaggies' very funny clip:

Om Nom - Twaggies by Twaggies