“Deep practice is built on a paradox: struggling in certain targeted ways—operating at the edges of your ability, where you make mistakes—makes you smarter. Or to put it a slightly different way, experiences where you’re forced to slow down, make...

“Long story short: a few years ago a group of American and Norwegian researchers did a study to see what made babies improve at walking. They discovered that the key factor wasn’t height or weight or age or brain development...

“Deep practice is built on a paradox: struggling in certain targeted ways—operating at the edges of your ability, where you make mistakes—makes you smarter. Or to put it a slightly different way, experiences where you’re forced to slow down, make...