I've read a lot of Dr Seuss books over the years and McElligot's Pool is one of my favourites, in part because of this passage, spoken by a boy after being told he's wasting his time fishing: "Hmmm ..." answered Marco, "It may be you're right. I've been here three hours Without one single bite. There might be no fish ... "... But again, Well, there might! " " Cause you never can tell What goes on down below! "This pool might be bigger Than you or I know!" Testers, I give you McElligot's Rule* : when you're chasing a might on the basis of a never-can-tell , it's worth putting your rod aside now and again to think about what you're tying to achieve, how, why and for who. * OK, heuristic , but we're rhyming today. Image: Amazon