I dove into work showing that highly credentialed experts can become so narrow-minded that they actually get worse with experience, even while becoming more confident—a dangerous combination. And I was stunned when cognitive psychologists I spoke with led me to an enormous and too often ignored body of work demonstrating that learning itself is bes

As adults, however, we have a tendency to err too far toward exploitation—we become content to fall back on the stock of knowledge and mental habits we built up when we were young, rather than adding to or revising it. We get lazy.

deliberately focusing on the new and harder material. Instead, I was using lazy learning, mostly only playing songs I already knew well.