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We know amazingly little about what happens beneath our feet. It is fairly remarkable to think that Ford has been building cars and baseball has been playing World Series for longer than we have known that the Earth has a core. And of course the idea that the continents move about on the surface like lily pads has been common wisdom for much less than a generation. Strange as it may seem, wrote Richard Feynman, ”we understand the distribution of matter in the interior of the Sun far better than we understand the interior of the Earth.