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Title: Big Disappointment
Review: When I saw this book in the book store I thought, "What a great idea! A simple geometric explanation of planetary orbits". Then I read the book's supposed proof of why the lines from the focus points of an elllipse to a boundary point make equal angles with the tangent line. The argument was both long-winded and completely invalid! By way of comparison check the elegant proof given at the beginning of *Geometry and the Imagination* by Hilbert and Cohen-Vossen. I can't imagine that Feynman was responsible for this. The only reasonable conclusion is that the authors of this book don't know what they are talking about.
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