A butterfly flapped its wings last June and nine months later sport is still dealing with the fallout. It happened when Dr Steve Haake, a professor of Sports Engineering at Sheffield Hallam University, was confronted with a case of self-plagiarism committed by a contributor in a set of conference proceedings he had edited in 2006. It got Haake thinking about a similar incident in his life from around the same time. In 2000, he wrote an article called Physics, Technology and the Olympics, for Physics World. In 2012, he was surprised to find much of that same article repeated, verbatim, in an editorial published in 2005 by the editor in chief of the British Journal of Sports Medicine, Dr Paul McCrory. After dealing with the one old case, Haake decided, at last, to do something about the other.