Biosecurity

Over and over again, the military has conducted dangerous biowarfare experiments on Americans

The military tested how a biological or chemical weapon would spread throughout the country by spraying bacteria as well as various chemical powders — including an especially controversial one called zinc cadmium sulfide. Low flying airplanes would take off, sometimes near the Canadian border, "and they would fly down through the Midwest," dropping their payloads over cities, says Cole.

These sprays were tested on the ground too, with machines that would release clouds from city rooftops or intersections to see how they spread.