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The answer I have heard to the windsock question is for firemen and HAZMAT folks. If something tips over filled with something really nasty- like chlorine, as an extreme illustration- emergency responders can readily determine which way and how fast the wind is blowing. That way they can determine where to park their vehicles- not as goofy as you would think- and where to start evacuating unprotected people. <br /> <br />Erik
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