The U.S. government has now admitted to carrying out a mysterious fog experiment..

The U.S. government has now admitted to carrying out a mysterious fog experiment over St. Louis, spraying a chemical that contained a carcinogen on thousands of unsuspecting residents.

Officials specifically chose St. Louis because its layout resembled Moscow’s, making it a Cold War testing ground.

The spraying went on for years, while people unknowingly lived under the toxic haze.