"There was that sense of we had turned the corner. All of that time, all of that work, all of that effort – we were poised to make that next jump."

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Pi is not merely the ubiquitous factor in high school geometry problems; it is stitched across the whole tapestry of mathematics, not just geometry's little corner of it. Pi occupies a key place in trigonometry too. It is intimately related to e, and to imaginary numbers. Pi even shows up in the mathematics of probability

— Robert Kanigel