Heck, if the government really is going to spend $200 billion to rebuild New Orleans, they might as well rebuild it as the city of tomorrrow complete with kelp farms, electricity generated by tides, public transportation light as a cloud and efficient and almost noiseless, parks that are nice and safe and clean. It could be a proof-of-concept city for all those innovations you see in the middle of "Popular Science" that are always "just around the corner." I draw the line at dog-walking robots and the bubble dome (for now), but you get my drift, I suppose. Well, I...