I think this confuses (fact) knowledge and the ability to recognize causal relations. A human can never be smarter than said human: Our brains are not connecte

I think this confuses (fact) knowledge and the ability to recognize causal relations. A human can never be smarter than said human: Our brains are not connected and we can't share capacity with others. So, discovering causality is always an individual experience. And that happens likely by "playing" with "the world". I think it's noticeable that smarter animals are more playful. Which is also a hint that points to the fundamental importance of interaction with the world as a prerequisite for "smartness". Additionally the capabilities of the "sensors" and "actors" that make interaction with the world possible in the first place seem to be crucial to develop "smart behavior". The part about the "sensors" seems quite obvious. I think one can gain a better general understanding of some thing if one can "experience" it in more than one "dimension". And the "actors" allow one to perform "experiments" with the things around one, and find out this way how that thing "works" or is supposed to be "used". That's actually the behavior that can be observed in children of all kinds of "smarter" species. So it seems to be at least linked somehow to "smartness".