[quote=Mistress Dizzy]
..Romans had concrete? *blink*BTW, I am working on the profile. Just having a hard couple of days. >< Keep getting migraines. Not sure what's causing them.
[/quote]

Not only concrete but they discovered how they could have concrete that solidified while underwater. They were geniuses that unfortunately had a series of bad leaders that led to their downfall and put mankind about 1,500 years behind where it could have been