Roman Inventions

[Nihonius Legio]

They invented fast food huh? Well they had plenty of olive oil to fry everything in I guess. I know the Romans (especially plebs) ate at restaurants most of the time, which were usually placed on the ground floor of appartment buildings, or between two buildings.
I've been findings sites that say Romans did not invent aqueducts or concrete, but just improved on older versions of other cultures. They say Mesopotamians made the first aqueducts, but the Romans made the best, and that other cultures before Rome made concrete with gypsum instead of volcanic ash. I'm pretty sure though that I heard from the History Channel that Romans really did invent concrete. Anyone have more knowlege on this? I also heard a funny thing that Romans invented the popsicle....