It's kind of funny how scientists and people today just assume that ancient humans were just plain stupid. Humans have been remarkably resourceful for as long as we have existed and understood complex issues as well as we do today. Just because they lived thousands of years ago doesn't make them unintelligent, and it's a shame how much knowledge was lost from ancient civilizations through war natural disasters.

It's fascinating that the Egyptians seemed to have some grasp of sound frequencies, but the knowledge was lost to time. We may never fully understand the reasons they used it in building, but it gives us a reason to keep studying the past.

When the dark ages came in Europe we lost thousands of years of knowledge of the Romans, just imagine how much more advanced the human race could have been today without the 500 years squandered on stupidity mostly in the name of religion...