Earth’s core rotating faster than the rest of the planet

At www.physorg.com/print217429744.html there is a report on a paper due to be published in Nature Geoscience, a news release by the University of Cambridge. It was found in earlier studies that the core of the earth was rotating faster than the rest of the planet. It seems this new paper is going to say the same thing – except that it is not rotating as fast as previously calculated. For the research, seismic body waves were passed through the centre of the earth, and measured.