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Title: Never Lost, just rightfully forgotten
Review: This lecture was *not* part of the course that became the great "Feyman Lectures" textbooks. It was given the next year as a filler to another class. Feyman derived this geometric proof of eliptical orbits based on scattering work by Fano, but the postscript says the same proof goes back to Hamilton. It's of some interest to hear Feynman answering students questions at the end. But based on their questions it's clear he didn't do a great job even if you could see the blackboard. So, really, you should only buy this book if you want to learn the proof as presented by the authors. If you can get ahold of his Messinger lectures they're much more well organized and more entertaining, and cover the basics of planetary motion (equal areas/time, and the period/radius relationship) but not the orbits being eliptical. There was almost no humor in this lecture. I was disappointed.
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