The largest US underground bomb was detonated on Amchitka Island, a remote Alaskan island.
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Nine thousand scientists from 43 nations signed a petition to ban nuclear testing.
US President Franklin D. Roosevelt received a letter from Albert Einstein detailing the possibility of atomic weapons.
Alaska Airlines started operating.
French President Jacques Chirac announced France's nuclear test program had finished.
Colombia's militant group FARC agreed to lay down their weapons after 52 years of guerilla warfare.
