A typical generation is 25 years long; that makes 4 in a century, and 200 over last 5000 years.
Just 200 generations! Anthropocentric arrogance on its claims to civilization.
Incidentally, man came to know of “heart” as an organ with circulation system concept 400 years ago (William Harvey…); previously liver was thought to further life functions.
Would take an easy 50,000 years for man to grow up.