“You know how when you’re trying to solve a problem, you can mull over it for days with no progress, and then suddenly, even though you haven’t learned anything new, the answer comes to you?” He nodded. “Insight.” “Exactly. Insight. How does the brain do that?” He stared at her for a long while. She stared back, as if they were both waiting for insight to find him. “I have no idea,” he said finally,
