**The Science Behind Japan's Fan-Cooled Work Jackets**
Air-cooled work jackets, invented in 1999 and perfected in 2004, use battery-powered fans to keep Japanese road crews cool in extreme summer conditions. With m…
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Air-cooled work jackets, invented in 1999 and perfected in 2004, use battery-powered fans to keep Japanese road crews cool in extreme summer conditions. With m…