On a cold December night in 1949, the U.S. government deliberately released a massive radioactive cloud into the air over Washington state… while thousands of Americans slept nearby with no idea what was happening.
This is the true story of the Green Run — a secret Cold War experiment at the Hanford nuclear site designed to simulate Soviet nuclear production. Officials bypassed safety filters, processed highly radioactive fuel after only 16 days of cooling, and released far more iodine-131 than planned.
Winds shifted. Rain fell. The invisible cloud spread across communities, contaminating grass, water, and the food chain. People became known as the “Downwinders.” For decades the truth remained classified.
This wasn’t an accident. It was an experiment. And ordinary people were never asked.
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