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-20%
Low Temperature Stirling Engine
Original price was: $49.99.$39.99Current price is: $39.99. Buy on AmazonThis Stirling engine converts small amounts of heat into kinetic energy!
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Solar Power Radiometer
Original price was: $39.00.$27.99Current price is: $27.99. Buy on AmazonPut photons to work and they will spin the tiny plates for you.
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