In order to exercise your critical thinking about a field, you need to know quite a lot about it. When we're thinking critically, we're actually drawing on our long term memory and knowledge of things that we've built up over time. But if we have to spend time getting that basic knowled into the long term store in the first place, it's very hard for us to do both at once. And so i think it goes back to really kind of ar fundamental mistake about how people learn.