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Children who live in cities in the Northeast are much more likely to have asthma. But a wider look finds that poor children in the suburbs are at high risk, too.
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The toxins' presence is blamed on algae from Lake Erie, sparking a water ban that has affected about half a million people since it was first announced this weekend.
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Lead exposure lowers children's IQ and causes aggression. But children exposed to low levels of lead show different symptoms, including more depression and anxiety, a study of preschoolers finds.