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I must admit I was unaware of this controversy, but it makes some sense to stop using the constant pi, and to use a new term, tau, instead. Tau is defined as 2 times pi, which would be 6.283.  This is explained in a fun article in a recent Scientific American story:     http://www.scientificamerican.com/article/let-s-use-tau-it-s-easier-than-pi/   Tau relates... read more