My first class of my first day of college was Calculus I. My professor had been working on this project for about 7 years before that, developing a statistical model that could predict crime tomorrow using years of past crime report data. He had an early version of the algorithm implemented in an HTML page with three <textarea> boxes, and a button that invoked a JavaScript implementation of the PredPol algorithm. I helped him make the software better and more usable so we could get it into the hands of more police departments around the world. And then a couple of years ago I left.