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Today, it seems as if we define civilization in terms of the small things, like decoded strands of DNA, splitting atoms and microscopic bumps on plastic compact discs. With a focus so fine, it's easy to forget the bigger, simpler things that got us here and continue to define our lives. Back up a bit and look at what the real world is made of. In there with wood, steel and glass you'll find another material quietly holding it all up. You'll find concrete—and, a lot of it.