Refrigeration technology has come a long way since ancient Chinese cultures harvested ice from frozen lakes and desperately tried to keep them insulated in ice cellars more than a thousand years ago. The technology advanced through the subsequent centuries, culminating in an exponential explosion of growth over the last hundred years or so, with the advent of artificial refrigerants in the 19-teens and 20s. Still, these early-model units relied on toxic, foul-smelling gases such as ammonia and sulfur dioxide as condensing agents, resulting in fatalities …
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