John Young (who made this head-mounted water cannon I posted about in 2005) says:
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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.