If you spend most of your time at a keyboard, you can count yourself among the 60 million or so professionals known as “knowledge workers”—a term Peter Drucker coined in the 1960s to describe academics, tech people, analysts, essentially, anyone who didn’t work a physically demanding job. You know. People who “think” for a living. What a

Whether you work for yourself or someone else, there’s one thing I know about you: You want your work to matter. Even, or especially, if you’re afraid it doesn’t. Maybe your boss or clients heap praise on you. Maybe they don’t say a damn thing. But you want it to be good, and you want