Happy Friday, readers! As I get older, I appreciate the idea of mastery more and more. When I watched Rafael Nadal, who recently turned 36, win his 22nd major tennis championship a couple weeks ago, I was so impressed with his ability to play the game on all levels — physically (through a numb foot) as well as mentally/emotionally. His opponent, Casper Ruud, was about 15 years younger and theoretically had more strength, energy, and hunger to win. And yet Nadal