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This 1878 Mirror Heats Factories to 400°C With No Fuel and No Running Costs — Why Don't We Use It?...This $18 Chimney Generates Electricity From Heat Alone — No Fuel, No Power...This $8 Volcanic Rock Battery Outperforms Sand — Holds Heat 40% Longer
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This 1878 Mirror Heats Factories to 400°C With No Fuel and No Running Costs — Why Don't We Use It?
This $18 Chimney Generates Electricity From Heat Alone — No Fuel, No Power
This $8 Volcanic Rock Battery Outperforms Sand — Holds Heat 40% Longer