Here is a word for your vocabulary list: *triskaidekaphilia*. The 13th Carnival of Mathematics at Polymathematics features facts galore about the number 13, plus several math blog articles for your enjoyment.

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# Mathematics Carnival #13

*triskaidekaphilia*. The 13th Carnival of Mathematics at Polymathematics features facts galore about the number 13, plus several math blog articles for your enjoyment.