“Goofing off is not a waste of time — well, not always. Exhibit A: Albert Einstein. He was a world-class loafer. In 1905, he was working as a clerk at a Swiss patent office, spending a lot of time spacing out. A ‘respectable federal ink pisser’ is how Einstein described himself. Yet it was at work, daydreaming one day, watching a builder on a nearby rooftop, that he experienced ‘the happiest thought of my life’ — a thought that soon blossomed into his ‘special theory of relativity.'”