Smith and Wesson patented the first metal bullet cartridges.
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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.
The United States conducted its first and only nuclear artillery test at the Nevada Test Site.
The first private research atomic reactor opened in Chicago, Illinois, US.
The largest US underground bomb was detonated on Amchitka Island, a remote Alaskan island.
Colombia's militant group FARC agreed to lay down their weapons after 52 years of guerilla warfare.
