1941 July - British 'MAUD' Committee reports that a weapon could be made with 10 kg of U-235; U.S. Academy of Sciences endorses bomb program. More » 1945 July 16 - U.S. explodes first atomic bomb, the Trinity test, at Alamogordo. More » 1946 July - Demonstrations in Times Square, New York, against nuclear testing. 1962 July 6 - Sedan excavation experiment by Plowshare.
July 8 - EMP from high-altitude burst turns off street lights in Oahu, Hawaii. More » 1968 July 1 - Non-Proliferation Treaty opened for additional signatures. More » 1980 July 15 - The U.S. reports that the light signals recorded over the South Atlantic on September 22, 1979 were probably not from a nuclear explosion. This was later proved to be false. More »