It turns out (SpaceX and Tesla founder) Elon Musk is also a firm believer in "experiential education." In a recent interview he said, "When you struggle with a problem, that's when you understand it." And, in fact, he said that when he interviews job applicants, he'll often ask them how they solved certain problems. If they can't articulate the layers of the process, the details of the struggle, he knows they're lying about their experience—"anyone who's struggled hard with a problem never forgets it." With the struggling comes a thorough understanding.