Spinning at Different Speeds

The earth turns -- but some parts of the earth turn faster than others. An article in the latest issue of the journal Science provides evidence that the earth's core is rotating at a rate faster than the rest of the planet. AM 580's Jim Meadows talked with a University of Illinois scientist who co-authored the study. Xiaodong Song (left) says their findings end a nine-year debate on the question and provide more information about the earth's magnetic field.