In science, feeling confused is essential to progress. An unwillingness to feel lost, in fact, can stop creativity dead in its tracks. A mathematician once told me he thought this was the reason young mathematicians make the big discoveries. Math can be hard, he said, even for the biggest brains around. Mathematicians may spend hours just trying to figure out a line of equations. All the while, they feel dumb and inadequate. Then one day, these young mathematicians become established, become professors, acquire secretaries and offices. They don’t want to feel stupid anymore. And they stop doing great work.