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The history of keeping cool

POSTED: 09:24 AM PDT Jul 18, 2012    UPDATED: 06:59 AM PDT Jul 16, 2013 

With temps on the rise nationwide, 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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