The history of keeping cool

Published On: Jul 18 2012 09:24:26 AM PDT   Updated On: Jul 22 2014 05:02:05 AM PDT

This week marks the 112th anniversary of air conditioning, and aren't we all thankful! Look back at the ways humans have tried to stay cool through the centuries.

Cooling - Egypt
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Evaporative cooling, which adds moisture to the air that cools things down as it evaporates, dates back to ancient Egypt. Egyptians would hang wet mats in doorways or have slaves fan jars full of water. Similar techniques can be found in American Indian communities, the American West and 19th-century textile mills.

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