In 1816, engineer Robert Stirling invented his proprietary Stirling engine, an automatic power source operated by ambient heat rather than direct fuel sources like an internal combustion engine. It was quite a nifty little contraption, serving as the bedrock of the steam engine concepts that followed, though it never saw widespread adoption since you still needed a source of heat to make it work, and obviously, you can’t just get heat anywhere. Still, while you can’t use a Stirling
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