This is the purest way I've ever seen to explain the phenomenon of 'regression to the mean'. It's a well-known phenomenon, and explains a lot of things, from why test scores at the worst schools tend to improve the next year, through why patients who visit a homeopath seem to feel better, to the Sports Illustrated Jinx.
However, the Austrian motorway authority seems never to have heard of it. They recently asked some druids to reduce the number of fatalities at a few accident blackspots by burying some magnetic slates. The results were a roaring success:
Austrian motorway authority ASFINAG said it was sceptical at first and kept the project a secret. But it went public after the druids’ efforts cut the number of deaths at the notorious crash site from six a year to zero in two years.I don't think there's much more to say.