John Young (who made this head-mounted water cannon I posted about in 2005) says:
Like most of the country, West Chester, PA is INSANELY hot and muggy right now.
In desperation, I connected a homemade swamp cooler (plastic bucket, bag of ice, electric fan) with a 3M positive-pressure welding helmet to make a: REFRIGERATED SPACE HELMET.
I think the next step is to switch to a battery-operated fan, put the cooler on a wagon, and then I can walk all around in delicious, frosty coolness.
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects