I think you really have to know about things that are only in people's brains. But everyone has that intuition that you want the data to just tell you everything, but in certain environments, I just don't think it's possible. That is like the thing I'm dealing with on such a regular basis now: we've built this giant model and it's had, I don't know how many people,. probably 10 people have inserted their assumptions into the system; they're missing history of why each assumption was added. And so you, we have to go through this period of training new people.