A baseball cap that lets you keep a cool head in the sun (W0 97/27771) has been patented by German inventor, Michael Stein. The top of the cap has a network of tubes that carry water from a container strapped on the side. Water leaks from holes in the tubes, and is drawn across the surface by capillary action. On a sunny day the water evaporates, cooling the wearer鈥檚 head.
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