Wow! Great discussion everyone! Thanks so far for all of the insightful information, really glad this discussion has actually gone somewhere, as I must confess that I have learned quite a bit so far by merely browsing the forums, LOL!
I'd like to ask a question regarding "lost information". I notice some of you have posted that Medieval Europe had 'forgotten' a lot of the technologies of the ancient Romans. My question is, "How does this happen?". I mean, how does an empire that holds hundreds of thousands of people and even I remember correct, 1 million at one point, forget things such as concrete and recipes? Would be very interested in hearing how this broke down.