We also have knowledge of what NASA was like then and its budgets. But still, rebuilding Saturn requires understanding why the rocket designers chose to make the engine only so big. They wrote down the design, but they did not say what ideas they considered and why they made the choices they made. We do not have those whispers in the ears. Humans have invented all sorts of written codes and other recording and storage devices for knowledge.
People come to the Silicon Valley to get that knowledge through human networks.
The hope of some participants is that a better understanding of these networks will permit their scaling up so more regions of the globe can reap economic benefits from a knowledge-based economy. Merlin Donald, a neuropsychologist at Queen's University in Canada, laid out the evolution of the human brain in order to explain the cognitive constraints on knowledge use and transfer. We still need all the lower structures for what we think of as the subconscious level. The first big change in the human brain took place about 2 million years ago, when the species developed whole-body expressions, including mimicry and group displays such as dance, he said. A second transition, in which the jaw also enlarged, came about 500,000 years ago as humans developed oral language and narrative thought.