Nine thousand scientists from 43 nations signed a petition to ban nuclear testing.
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Machine guns were fired from a US airplane for the first time.
Nearly one million people protested for the disarmament of nuclear weapons in Central Park, New York City.
The United States and Russia signed the Moscow Treaty, agreeing to limit their nuclear arsenals.
The largest US underground bomb was detonated on Amchitka Island, a remote Alaskan island.
Albert Einstein warned against hydrogen bombs on the ''Today with Mrs. Roosevelt" weekly TV show.
