Some newly declassified documents show that the US government knowingly sprayed all of San Francisco with a biological agent after World War II. How often does something like this happen? How many conspiracy theories are real? Are we more susceptible to paranoia than we believe we are?

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Today's story was sent in by Soryo21! http://www.iflscience.com/health-and-medicine/us-military-simulated-biological-warfare-san-francisco

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