Are some chemicals more dangerous at low doses?

There are some 82,000 chemicals used commercially in the U.S., but only a fraction have been tested to make sure they're safe and just five are regulated by the U.S. Environmental Protection Agency (EPA), according to congressional investigators. But a government scientist says there's no guarantee testing actually rules out health risks anyway.

http://www.sciam.com/blog/60-second-science/post.cfm?id=are-some-chemicals-more-dangerous-a-2009-04-03

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