1958 US–UK Mutual Defence Agreement as an atomic spy, caused the proposal to be dropped. The June 1951 defection of Donald Maclean, who had served as a British member of the Combined Policy Committee from January 1947 to August 1948, reinforced the Americans' distrust of British security arrangements. The first British atomic bomb was successfully tested in Operation Hurricane on 3 October 1952, but although it was more advanced than the American bombs of 1946, Britain was still several years behind in nuclear weapons technology. The United States conducted Ivy Mike, the first nuclear test of a true thermonuclear device (also known as a hydrogen
What If (story) What If (story) "What If—" is a fantasy short story by Isaac Asimov that was first published in the Summer 1952 issue of "Fantastic" and reprinted in the 1969 collection "Nightfall and Other Stories". The story was inspired by the author's wife, who challenged him to produce a story based on a train trip they were taking to New York. A married couple is traveling on a train from Boston to New York City. They meet a mysterious silent man known only as Mister If, who shows them a small portable television-like device about in size. (Mr. If's first name