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I read a comment on Hacker News somewhat recently about long division being unintuitive ... I feel a proof is the best way to see something intuitively. Here is my attempt at proving the long division algorithm.

First of all this tutorial will only be useful if you have a Mac. It also assumes some very basic familiarity with the command line (I won't…

So, you want to allow users to run arbitrary code on a page you don't have access to or influence over. One solution is to create a browser…