Message to the Earth’s core: slow down! It seems that scientists have suspected for about a decade that the Earth’s core rotates faster than the rest of the planet. They have now presented data showing that the core rotates about a half degree more per year than the surface. This is not entirely unprecedented in our solar system; we know that the surface of the Sun rotates at different speeds depending upon latitude. So I’m just wondering: what does this have to do with the fact that the Earth’s magnetic field reverses itself every 200,000 years or so?

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