I've heard the theory that says that it was because of the economy based on slavery (which made people think that working with your hands (ie experiments) was for slaves only so they didn't experiment anything) but was it just because of that? In Alexandria and during that time period there are records of big ideas that were proved in the 20th century and all that. So why did all that stop? Why did we enter the "dark ages" if we had such a history of at least looking and theorizing?