The Environmental Protection Agency announced Monday that it is formally listing Bisphenol A -- a chemical found widely in consumer goods -- as a "chemical of concern."

The chemical is added to plastics to harden them, and has been used in soda cans, baby bottles and food containers. It is so widespread that 90 percent of Americans show traces of it in their urine. But, in recent years, studies have linked BPA to heart disease and cancer in humans, and to abnormal development in animals.

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