For decades now, Adam Gopnik has been one of our most beloved writers, a brilliantly perceptive critic of art, food, France, and more. But recently, he became obsessed by a more fundamental matter, one he had often meditated on in The New Yorker: How do masters learn their miraculous skill, whether it was drawing a museum-ready nude or baking a perfect sourdough loaf? How could anyone become so good at anything? There seemed to be a fundamental mystery...