Earth's inner core may have started spinning in the other direction.

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New research says that the earth's inner core, a hot iron ball the size of Pluto, has stopped spinning in the same direction as the rest of the planet and might even be rotating the other way. Roughly 3,100 miles below the Earth's surface, this "planet within the planet" can spin independently because it floats in the liquid metal outer core. Precisely how the inner core rotates has been a matter of debate between scientists - and the latest research is expected to prove controversial. What little we know about the inner core comes from measuring the tiny differences in seismic waves as they pass through the middle of the Earth. (CBSNews)

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