Earth's inner core slowing since 2010, lengthening days slightly

Earth's inner core has been rotating slower since 2010, potentially lengthening days imperceptibly. Seismic data from 1991-2023 confirms this trend. The inner core's slowdown could affect Earth's rotation. Changes are minimal, with alterations in the order of thousandths of a second. The cause of this "backtracking" remains unclear, possibly due to the outer core's churning or gravitational influences from the mantle. Researchers aim to further study this phenomenon.