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For folks with a large stream on their property, a Pelton Wheel system like this is fantastic: Algonquin Eco-Lodge – 12 kW Micro-Hydro Turbines

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Why we face grave danger from space: The discovery that a colossal solar flare hit Earth in the Dark Ages reminds us that catastrophe could strike at any time, says Michael Hanlon.

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.50 BMG shooters might find this reference page on specialty military rounds of interest.

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Mike Brown is planning to build a new generation of reliable 8 horsepower steam engines that will be able to run a 5 kilowatt generator.

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