@BartoszMilewski If you invert the question, it feels less puzzling: why do we treat “66 million years” as a naturally meaningful chunk of time at all?
Most of our deepest claims about reality - causality, locality, stable constants - are extrapolations from an absurdly tiny empirical foothold: a thin slice of time and a minuscule patch of accessible space.
So maybe the real surprise isn’t that our theories feel incomplete—it’s that our pea-brain models generalize as far as they do.

@BartoszMilewski
The (relative) size of the brain would be a pretty good indicator. A skull with unusually large cavity could survive that long. AFAIK we have not found one yet.

+Question: by your standards are there any extant intelligent species outside humans?

@BartoszMilewski there was some speculation that such species not only had existed, but survived and founded Facebook

@BartoszMilewski Pretty sure an intelligent species would never make anything like a pyramid.