Refrigeration just got a sustainable upgrade, and it didn’t come from a Silicon Valley startup or a government lab — it came from the brilliant minds of three teenagers. These young innovators recently won the 2025 Earth Prize for creating a refrigerator that runs on just salt and water. That’s right — no electricity, no fossil fuels, just simple science and groundbreaking ingenuity. Their invention isn’t just a clever science fair project — it’s already being deployed in hospitals to safely store medicine and even organs. The potential applications in developing nations, disaster zones, and remote areas are enormous. This...