Interest in residential geothermal systems has grown as more people realize they can replace their fossil-fuel heating system with one that is three to five times more efficient and doesn't require a chimney to exhaust noxious fumes. These newer...more details Format:Paperback Pages:188
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A new unified theory of mass extinction that identifies the primary cause for the 'Big Five' mass extinctions as a gravitational one. The theory proposed in this book posits a lowered surface gravity as a result of the coalescing of the continents that formed the supercontinent Pangea...more details Format:Paperback Pages:204