Over the years, he has experimented with cooking, rocket science, music, electronics, decorating, telecommunication, chemistry and many other hobbies, all with uniformly catastrophic results.
In rocket science, the overbar signifies a smoothing function, so the formula should have calculated the smoothed value of the time derivative of a radius.
They tend to be very specific to industries or activities of very large risk and huge potential loss, such as rocket science, airplanes, trucks, battle tanks, submarines etc.
