 I'm an eternal optimist. If I wasn't an optimist, I couldn't possibly get up every morning saying, I think I'll work on my water machine to supply clean water to 4 billion people, or an electric generator to the 2 billion people that have ever used electricity. Or let's get first into every school in the country and get kids more excited about developing the muscle hanging between their ears. I mean, on the one hand, most of the projects I do take years and years and years and years. But every once in a while, one of them will become an instant overnight success after 10 or 15 years. You have to be an optimist to get up every morning knowing it's probably 10 or 15 years before this one's going to work. But you have to believe today is going to be the day it happens.