Megacities

I have to admit, I had no idea these cities were so huge. I think alot of my perceptions of the world's cities are probably holdovers from years ago. I don't really think I'm alone here, either. I'd be willing to bet that these problems are pretty serious in alot of other places besides just these massive cities, though. Perhaps some of the success stories could be used here in the US and in places like China...