1836 Samuel Colt manufactures 1st pistol, 34-caliber “Texas” model
1945 World War II: The Battle of the Ruhr begins.
1948 US rocket flies record 4800 kph to 126km height
1970 Nuclear non-proliferation treaty goes into effect
1970 Dubnium atoms are first detected conclusively.
1980 Earth satellites record gamma rays from remnants of supernova N-49