Tokyo in August is a brutal furnace:95 degrees Fahrenheit, 85% humidity.Just walking to the subway drenching your shirt in sweat.Yet on the streets of Tokyo, you see road crews and carpentersworking outside in the baking sun all day long.And when you look closely at them, they don’t look miserable.In fact, their jackets look strangely puffed up,like little astronaut suits.Listen closely, and you hear a soft, quiet whirring sound.They are wearing Kuchofuku — “air-conditioned clothing.”On the lower back of their heavy-duty work vest,two lightweight electric fans blow fresh air into the lining.The air circulates across their torso and exits through the collar and cuffs,instantly evaporating sweat and cooling the body by ten degrees.An engineer at a small Japanese manufacturing company invented itafter realizing that building air-conditioning couldn’t save people working outdoors.Foreign tourists are mesmerized by it:“Why doesn’t the rest of the world have this?!”Silicon Valley spends billions building algorithms to generate AI memes.A small Japanese workshop spent years tinkering with lithium batteries and fabricso that an ordinary roofer pouring asphalt under a scorching suncan smile and make it home safely to dinner with his kids.