In 1948, MIT checked Maria Telkes' test house in Dover, Massachusetts. Outside: 11 degrees. Inside: 72. No gas line. No boiler. No monthly utility bill. Just salt. A wire. And chemistry the lithium industry still doesn't want you studying. This Part 1 calls it the "$8 salt jar battery" — sodium sulfate from the pool store, a bucket, nichrome, foil insulation — under $40 once, pitched as decades of winter heat storage while they sell you an $8k–$14k lithium pack that dies in ~7 years. Important: on the science, this is PHASE-CHANGE HEAT storage (BTUs), not a drop-in electrical Powerwall swap. But the history is real. The DOE paper they cite is real. The incentive problem is real. Watch Part 1. Then tell me why your "green" battery bill keeps climbing. 🎥