Tony Fadell, the engineer who designed the iPod while at Apple, has come up with a terrific innovation, a smart thermostat. His thermostat is different from others because it learns as you use it. It could save a tremendous amount of energy if several million of them go into houses and replace the old dumb thermostats we’ve been using for most of a century. “Smart” thermostats have been around for decades, but people don’t bother to get the Ph.Ds necessary to program them. I am sure other companies, like Honeywell, will try to come up with a competing product, but can they make them simple and gorgeous? Not likely. Mr. Fadell has Apple in his DNA.