 Recall the raven paradox: the hypothesis that all ravens are black is logically equivalent to the hypothesis that all non-black things are non-ravens. Yet the latter would seem to be confirmed with each discovery of a non-black, non-raven…red shirts, blue underpants, etc. Yet examining the contents of your neighbor’s clothesline doesn’t seem a good way to research an ornithological hypothesis. (Nor does it seem a good way to treat your neighbor.)