The first private research atomic reactor opened in Chicago, Illinois, US.
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The world's most infamous clown, John Wayne Gacy, went on trial after he murdered 33 young men in Cook County, Illinois.
President Truman announced to the people of America that they successfully developed a hydrogen bomb.
The Soviet Union started mass producing the AK-47 assault rifle.
Nine thousand scientists from 43 nations signed a petition to ban nuclear testing.
An F5 max rating tornado smashed through Plainfield, Illinois, killing 29 people, injuring 353, and causing $165 million in damages.
