Business
Marathon Fusion Turns Mercury Into Gold via Fusion Neutrons
San Francisco startup Marathon Fusion announced on October 21, 2026, that it experimentally transmuted stable mercury-198 into stable gold-197 using deuterium-tritium fusion neutrons. The company reported a production rate 10 times higher than CERN's 2025 benchmark, while simultaneously generating cancer-fighting copper-64 and copper-67 isotopes from zinc.