This week David and Mike head "Underground" to learn about how a city's underground systems work. I know, sounds like a snooze-fest. BUT, not only is there a lot to learn about city building, there are little pieces of humor in the pictures that will draw you in. We really dig this intriguing book by another David, David Macauley. Looking for an episode we touched on in this one? How about: Little House in the Big Woods Email Us-
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