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Associated Press
Cuyahoga County Board of Health lead risk assessor Tom Barsa swipes a kitchen floor for lead Thursday, April 4, 2013, in Lakewood, Ohio. More than half a million U.S. children are now believed to have lead poisoning, roughly twice the previous high estimate, health officials reported Thursday. The increase is the result of the government last year lowering the threshold for lead poisoning, so now more children are considered at risk. (AP Photo/Tony Dejak)

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