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Who is credited with the contemporary version of Murphy’s law?

U.S. Air Force Maj. Edward A. Murphy, Jr., uttered a version of the phrase when he encountered an error during an experiment in 1949. Col. John P. Stapp cited “Murphy’s law” in answering a reporter’s question sometime later, and the law was born. It has spawned a number of offshoots, or corollaries, since then.