Scientists are astounded by Earth's magnetic field. It Is Shifting Toward Siberia and Raising Questions About Unusual Movement.

Dancing turtles have proved for the first time that some animals use Earth's magnetic field to create a personal map of their favorite spots, scientists said Wednesday.

Every few hundred thousand years, Earth’s magnetic poles flip, turning north into south and south into north. These geomagnetic reversals can take thousands of years, but shorter disruptions—called geomagnetic excursions—can occur more frequently and wreak havoc on the planet.