"Magnetism's Hidden Grip on Earth's Core"
The Earth's magnetic field, generated by electric currents in its liquid core, has been a fundamental force since the planet's formation. This magnetism, locked into iron-containing minerals as the Earth cooled, extends from the core to the atmosphere and beyond. The phenomenon has been known for thousands of years, with historical references to magnetic rocks like magnetite. Theoretical physicist Frank Close explores these concepts in his book "CHARGE: Why Does Gravity Rule?"