Look back at the history of fans, air conditioners and other ways humans have tried to stay cool through the centuries.
In the 1940s and 50s, air conditioners were marketed to offices as a way to increase productivity. The industry had stats to back this up, including one study that showed typists in a cooler office increased output by 24 percent, according to Time.
Boy Scouts of America
JASON REDMOND / Reuters
Library of Congress
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