Zen masters call it “know-nothing mind”: a state of openness and clarity without preconceptions—one that doesn’t foreclose on possibility. In his podcast conversations with “titans” of health, wealth, and wisdom, Tim Ferriss noticed a similar tendency: great achievers have the capacity to ask the questions others are afraid or unable to ask. They’re willing to risk looking foolish by asking “stupid” questions whose answers aren’t obvious to them—for example, why banks would give mortg...