Back in the 80's I gave my grandfather a solar powered hat with a fan on it that blows a wind on your head as long as the sun's out. I thought this would make his life working the farm in the hot sun more enjoyable. He never wore it beyond the mandatory initial try it on for everybody show. I always assumed it didn't really work because it was just a weird gimicky "future" thing. It worked. I guess it was too much technology for him. It still works, and now I'm wearing grandpa's hat.