Greenland just signed away the last 50.5% of the largest heavy rare earth deposit in the Western world. The yellow box on this map shows where it sits. As of April 30, it belongs to a Nasdaq-listed company. China just lost its biggest chokehold on the United States. Heavy rare earths are dysprosium, terbium, yttrium, holmium. They're the four elements that let a permanent magnet hold its field at 200°C inside an F-35, a Tomahawk, a Patriot battery, and an EV traction motor. Substitutes don't…