According to new research from geologists, the Earth’s core rotates just a little bit faster – about 1 degree per year – than the crust of the planet. The scientists took advantage of historical records for “earthquake twins” near the South Sandwich Islands. These are quakes that occurred in virtually the same spot with the same magnitude, but were years apart. As the seismic waves passed through the Earth, they were bent as they passed through the Earth’s iron core. The shape of this bending has changed over time, indicating the core’s faster rotation.