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The Associated Press . Josh Kroes sits in a lawn chair under a shade tree in Racine, Wis., on Wednesday evening. Kroes took a T-shirt, soaked it in water and froze it for about five minutes.

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Heat 'dome' steaming US

CHICAGO -- If the extreme heat and humidity lingering over much of the nation feels like a steam bath, it's because the same principles are at work in the atmosphere.

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