Nine thousand scientists from 43 nations signed a petition to ban nuclear testing.
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A nuclear bomb was lost off the coast of Georgia, US.
British Prime Minister Winston Churchill went public that Britain had its first atomic bomb and planned to test it in Australia by the end of the year.
Smith and Wesson patented the first metal bullet cartridges.
Adolf Hitler signed the order to develop the V-2 rocket as a weapon during World War II.
India had their first successful nuclear bomb test.
