The part of the brain most affected by early stress is the prefrontal cortex, which is critical in self-regulatory activities of all kinds, both emotional and cognitive. As a result, children who grow up in stressful environments generally find it harder to concentrate, harder to sit still, harder to rebound from disappointments, and harder to follow directions. And that has a direct effect on their performance in school.

And in most highly academic environments in the United States, no one fails anything.

If we don't give kids the opportunity to fail when they're growing up, and to fail productively, to fail creatively, that they're going to get out there into the world and they're going to hit some kind of setback, like everybody does, and they're going to get completely derailed.

The part of the brain most affected by early stress is the prefrontal cortex, which is critical in self-regulatory activities of all kinds, both emotional and cognitive. As a result, children who grow up in stressful environments generally find it harder to concentrate, harder to sit still, harder to rebound from disappointments, and harder to follow directions. And that has a direct effect on their performance in school.

What if the Secret to Success is Failure?.

Optimists, by contrast, look for specific, limited, short-term explanations for bad events, and as a result, in the face of a setback, they’re more likely to pick themselves up and try again.

If kids've been overprotected from failure in childhood, they get out into the world and they really get thrown off.