"You used to teach arithmetic. Then you taught long division and fractions, and then algebra and geometry and calculus. Now you are back to teaching arithmetic. Your teaching is a moving target. Which of those teachings is the right one?"
Replying to @KennethFolk
We spend too much time wondering what's "true" rather than what's useful, leading to a miserable and never-ending search for something that can't be found.
8:34 AM - 10 Feb 2018
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