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Can’t Wrap Your Head Around Pi? Here’s a Cool Visual to Help
Pi is an irrational number, and like some irrational people it just goes on and on. What is it with this crazy, crucial number?
So here's what I'm going to do: I'm going to use a brute-force algorithm I made in Python to generate all possible integer fractions and see if one of them equals pi. We didn't prove that pi is irrational, but I think any rational person would be inclined to accept it at this point. Because you can't write pi as a fraction of integers, the two circles will never sync back up.
Or read this on Wired