3/14 was Pi day. I thought it would be worth posting this interesting summary about the number Pi. Pi is an extremely interesting number that is important to all sorts of mathematical calculations. Anytime you find yourself working with circles, arcs, pendulums (which swing through an arc), etc. you find Pi popping up. We have run into Pi when looking at gears, spherical helium balloons and pendulum clocks. Plus, I like this “How Stuff Works” site.