The US tested the TX-17 thermonuclear bomb for the first time in Bikini Atoll of the Marshall Islands.
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Nearly one million people protested for the disarmament of nuclear weapons in Central Park, New York City.
The largest US underground bomb was detonated on Amchitka Island, a remote Alaskan island.
The Soviet R-7 Semyorka, the world's first Intercontinental ballistic missile, became operational.
Albert Einstein warned against hydrogen bombs on the ''Today with Mrs. Roosevelt" weekly TV show.
US President Franklin D. Roosevelt received a letter from Albert Einstein detailing the possibility of atomic weapons.
