In 1982, the people of Times Beach, Mo., were forced to abandon their town forever because high levels of the chemical dioxin were found. At the time, dioxin was considered one of the world's most dangerous chemicals. But nearly 30 years later, the EPA still can't decide just how dangerous it really is.
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Full story at http://www.npr.org/2010/12/28/132368362/a-chemical-conundrum-how-dangerous-is-dioxin?ft=1&f=1001
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