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 ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Simple air conditioners are really nothing more than a heat exchanger that move heat—or cold—from one ...

Imagine walking into your sweltering home after a long day, only to be greeted by a wave of oppressive heat. Air conditioners can feel like a luxury when temperatures soar, but what if you could ...