 And you're going to challenge you on those ideas. And what happens is the conversation ratchets up. You discard what doesn't work and you keep what does. And when you do that, you make discoveries and you make discoveries rapidly. And at the time, that period drew to a close. If you read history books, they'll typically describe sort of the sacking of Baghdad. It was a bad time for the city. And they say, well, it all came to an end.