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Fluctuations at Earth's core decide the length of the day, according to scientists.
To come up with the finding, Nicolas Gillet of the University of Joseph Fourier in Grenoble, France, and colleagues, modelled fluid behaviour in the Earth's core based on measurements of fluctuations in the magnetic field.
According to Gillet, the innermost region of the Earth's outer core periodically flows faster or slower, and this action "tugs" at the planet's magnetic field.