In this article, presented by HowStuffWorks.com, shows how a submarine dives and surfaces in the water. It also shows how life support is maintained, how the submarine gets its power, how a submarine finds its way in...
This web site, by HowStuffWorks.com, gives a complete explanation with pictures and diagrams of septic systems and waste water treatment plants and how they work. Also explains why one system may be chosen instead of...
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