'One of the largest human experiments in history' was conducted on the unsuspecting residents of San Francisco | WHAT REALLY HAPPENED

'One of the largest human experiments in history' was conducted on the unsuspecting residents of San Francisco

But one fact many may not know about San Francisco’s fog is that in 1950, the US military conducted a test to see whether it could be used to help spread a biological weapon in a “simulated germ warfare attack.” This was just the start of many such tests around the country that would go on in secret for years.

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