The Assignment Discovery series are some of the best documentaries out there - very thorough and informative. The first third of this ep is dedicated to Newton and Einstein's work on the laws of motion. It starts out with Galileo's experiments with acceleration, and Kepler establishing that planets have elliptical orbits. Then it gives a summary of Newton's three laws of motion, with visual aids. After that - a very brief overview of Einstein's general relativity.
The last two thirds are, as always, an in-depth study of a selected case of practical application. This episode's segment is unusually dramatic, commencing with the fiery death of seven astronauts during the disintegration of shuttle Columbia in Earth's atmosphere on February 1, 2003. The doc gives a detailed description of the science behind shuttle landings, followed by a synopsis of the investigation of the Columbia disaster. Fascinating stuff; 9/10.