Sludge Tested As Lead-Poisoning Fix Causes Stir Scientists using federal grants spread fertilizer made from human and industrial wastes on yards in poor, black neighborhoods to test whether it might protect children from lead poisoning in the soil. But is it safe?<img src="http://feeds.foxnews.com/~r/foxnews/scitech/~4/269618361" height="1" width="1"/>
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