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The history of keeping cool

Published On: Jul 18 2012 09:24:26 AM PDT   Updated On: Jul 16 2013 06:59:54 AM PDT

With temps on the rise nationwide, look back at the ways humans have tried to stay cool through the centuries.

Cooling - Window AC
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Window air conditioning units were introduced in the 1930s, but were still too expensive for most Americans, according to Time.


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