Is There a Body of Knowledge?

The problem with this body of knowledge idea is that if everyone has the same body of knowledge, where are the new ideas going to come from? If you think about it in the past before schools, the new ideas came from people whose history was completely different from other people's history. They had learned something for the sheer joy of learning that thing. So I just think that idea is a mistake. And furthermore, even if that idea was true, anything that even closer resembles it gives you a useful body of knowledge in the first place. That seems improbable to me. Absolutely.