sapphire_chan - You're right, a tour would be awesome...if I could figure out how to set that one up.
4evermom - Both of those are fantastic books.  My ds enjoyed reading them when we were going over everything electricity related and was absolutely fascinated with where all the wires ran.
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I think I ended up with something rather respectable and I'll share here just in case anyone else ends up looking for something similar.  There are lots of videos on YouTube including several by gov't agencies.  Our favorite so far is this one on how toilets work.  It was super cute and ds got such a kick out of it.  I came up with several children's books including: “Flush!  The Scoop on Poop Through Out the Ages” by Charice Mericle Harper, “Everyone Poops” by Taro Gomi (for my younger two), “The Truth About Poop” by Susan E. Goodman, “Toilets, Bathtubs, Sinks, and Sewers: A History of the Bathroom” by Penny Colman, “Wastewater (Dealing with Waste)” by Sally Morgan, and “Flush!: Treating Wastewater” by Karen Mueller Coombs.
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I also picked up a few books for myself in hopes of being a bit more informed so that I can better answer his questions.  I found “Goodbye to the Flush Toilet: Water-Saving Alternatives to Cesspools, Septic Tanks, and Sewers” by Carol Hupping Stoner, “The Toilet Papers: Recycling Waste and Conserving Water” by  Sim Van der Ryn, “What Did We Use Before Toilet Paper?:  200 Curious Questions and Intriguing Answers” by Andrew Thompson, “The Big Necessity: The Unmentionable World of Human Waste and Why It Matters” by Rose George, “Toilets of the World” by Morna E. Gregory (this one if I can get my hands on a copy I think might be interesting for us all to sit and work through), “The Porcelain God: A Social History of the Toilet” by L. Julie Horn, and “Flushed:  How the Plumber Saved Civilization” by W. Hodding Carter.
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I'm planning on coming up with some sort of service project that we can do as a family to either support worldwide access to clean water or sanitation. Â From what I can tell the numbers are pretty staggering on both fronts and it might be a good way to tie in something tangible as it were. Â Oh, and I'm definitely not discounting the suggestion made for taking apart some portion of the toilet and putting it back together. Â I think he'd get a kick out of that (especially since they don't have a Snap Circuits type equivalent in the toilet world). Â :0)
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So far on all accounts it's been rather eye opening!