Math Teachers At Play carnival #17

Math Teachers At Play #17 carnival is posted at Math Recreation. LOTS of stuff there this time!

Here are some of my picks: Circle of fifths and roots of two is of interest if you have studied music. This post explains the difference between equal temperament and Pythagorean tuning, from a mathematical point of view. All about A4 explores this common paper size and its special properties. And Pat's post You Might Be a Mathematician IF... was quite funny.
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