““The key to learning is feedback. It is nearly impossible to learn anything without it. Imagine you’re the first human in history who’s trying to make bread—but you’re not allowed to actually bake it and see how the recipe turns out. Sure, you can adjust the ingredients and other variables all you want. But if you never get to bake and eat the finished product, how will you know what works and what doesn’t? Should the ratio of flour to water be 3:1 or 2:1?””