A coil of copper, a battery, and a magnet can spin until the battery dies. That quiet rotation is also why phones, cars, and missiles depend on a handful of metals that almost nobody else can turn into magnets at scale.

One country controls the magnet rare earths the rest of the world needs. The deposits sit in many places. The hard part is pulling twins of the periodic table apart from dirt, waste, and heat, then keeping the know-how at home.

From AirPods and the Ford Explorer to Tomahawk fins, the same physics shows up. So does a pattern of cheap loans, export doors that slam shut, then reopen at prices that kill new mines.