My son (4 years old) and I are big fans of the tv show "How it's made" which gives interesting tours and insights into various manufacturing and industrial proc

My son (4 years old) and I are big fans of the tv show "How it's made" which gives interesting tours and insights into various manufacturing and industrial processes. He got really excited about last weeks episode: water treatment plants (not a joke - he's always been curious about flushing toilets and draining water) http://science.discovery.com/tv/how-its-made/ http://science.discovery.com/tv/how-its-made/