Here is a cool little engine powered by your hot coffee cup. This 2-cylinder low temperature Stirling engine is very simple to use. Simply put it over your tea or coffee mugs and give it a simply push to start it up. When it slows down, your drink is suitable to drink.
More gadgets like this: here
Two-Cylinder Stirling ENGINE powered by Hot tea/coffee
The above video shows this mini engine in action. You can find out more about it here.
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