Technologies that are somewhat useful today but which could become especially useful tomorrow, should this civilization collapse. Subjects begin with the history of fire and heat, then progress to topics relating to the manipulation fresh water. Heat and water make steam, which is the important middle chapter of this book. Covering steam's long history and concluding in ways one can with a few tools, create devices that can convert this renewable resource into important work. Solar energy and construction of passive thermal solar systems is the next topic. That and small efficient shelters which can benefit from solar technology.
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