Should you be the best at one skill, or be pretty good at a bunch of different ones? David Epstein, the author of Range: Why Generalists Triumph in a Specialized World, says that practicing one skill for 10,000 hours (as some have suggested) might not necessarily set you up to be the next Tiger Woods or the next chess grandmaster. But in a world where we’re constantly encountering new experiences, Epstein believes that the ability to take knowledge from one situation and apply it to another, to generalize, is what really pushes us ahead.