Earth’s core may have started to spin in the opposite direction

According to the study, published in the journal Nature Geoscience, seismic waves from earthquakes over the past sixty years were analyzed to track the movements of the inner core. The authors of the study, Xiaodong Song and Yi Yang of Peking University, said they found that the rotation of the inner core “nearly came to a halt in 2009, and then turned in the opposite direction.”