This pops up over and over.<p>But it is like "debunking" astrology. If you think you did, you didn't understand astrology: the "signs" are just to randomize so not everybody gets the same advice on the same day. Its purpose is to keep people out of ruts, for which it works.<p>This is similar to hunter-gatherers relying on omens to direct where to hunt: it keeps them from exhausting any single place.