Geophysicists have modeled how Earth’s magnetic field could form even when its core was fully liquid. By removing the effects of viscosity in their simulation, they revealed a self-sustaining dynamo ...

Earth’s magnetic field is quietly, steadily changing, and the shift is no longer just an abstract concern for geophysicists.

For more than a century, engineers have chased new ways to turn the planet’s natural motions into usable power, from tides to ...