Culture is incredibly sticky. I should have remembered that. Larry, with Bill Campbell’s prodding, wanted Nest to come in and shift Google’s entire way of thinking, to give it a burst of startup mojo. But culture doesn’t work that way—you can’t repaint an old factory and show the workers a training video and think you’ve made any kind of difference. You have to tear the whole thing down and rebuild it again. Most people and companies need a near-death experience before they can really change.