30 years back in time here is Roof Garden. Its part 1 more is comming. Video Rating: / 5

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more at http://scitech.quickfound.net/ “Solar Energy Research Institute… This program looks at the history and uses of wind power, used for centuries by humans to move boats, pump water and grind grain including discussions on efficiency, problems in the urban environment, experimental systems and windmill use across the United States.” NEW VERSION with improved video & […]

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