DuPont and 3M, makers of Teflon and Scotchgard, will remove a key ingredient used to make nonstick and stain-resistant products that also contaminates our bodies and the global environment. The move away from the chemical, known as PFOA, affects just a small fraction of DuPont's and 3M's business and won't take effect until the end of 2006. The compound, being studied by the U.S. Environmental Protection Agency as a potential carcinogen, will still be used in other consumer and industrial products. "It's a small part of our sales," DuPont spokesman R. Clifton Webb said Tuesday. "We're taking this step not...