Slightly off-topic, but I can not recommend Khan Academy highly enough. Between the directed learning and the helpful videos, I am working to improve my kids understanding of maths and usually don't lose my temper. Prior to that, it was a frustrating exercise for everyone involved.
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[ 0.24 ms ] story [ 13.8 ms ] threadAs is it would be largely impacted by population. https://xkcd.com/1138/