The history of keeping cool

POSTED: 09:24 AM PDT Jul 18, 2012 

Look back at the history of fans, air conditioners and other ways humans have tried to stay cool through the centuries.

Cooling - Oscillating Fan
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Oscillating fans began showing up in the U.S. in the early 20th century, thanks to electricity and inventor Nikola Tesla’s alternating current motors, according to Slate.

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