It was Lord Kelvin, the great British physicist and thermometer enthusiast who said, “To measure is to know. If you cannot measure it, you cannot improve it.” Perhaps this is obvious, but it sounds more impressive when it’s said by a great scientist. (In the interest of full disclosure, he also said “Heavier than air flying machines are impossible,” which is obviously wrong. But having been forced to fly coast-to-coast in an economy-class middle seat, I don’t think he was that far off.)