The inner core of the Earth, a solid piece of iron 2,400 kilometres in diameter, is rotating faster than the rest of the planet. At its equator, it moves under our feet by more than 20 kilometres a year.
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Whaler, K., Holme, R. Catching the inner core in a spin. Nature 382, 205–206 (1996). https://doi.org/10.1038/382205a0
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DOI: https://doi.org/10.1038/382205a0