A decades-old Superfund site poses new threats to displaced communities.
It's all about the silver coins.
Scientists now think it might put young brains at risk.
Nearly half of Americans suspect that their water might be unsafe.
Before this 14th-century plague, there was lead in the air.
Even moderate exposure might lower IQ
The country's environmental chief tells PopSci why the holiday is more important than ever.
With some help from the cast of 'Sesame Street'
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