In science, as in life, simple questions rarely have simple answers. That principle of uncertainty is especially frustrating when researchers try to determine the hazards of various chemicals to humans. Ten years after sounding an alarm over the dioxin-contaminated roadways of Times Beach, Mo., federal scientists wonder whether they acted too hastily in ordering the community's permanent evacuation. Perhaps, they say, dioxin was not such a serious threat after all. This kind of waffling only reinforces public skepticism about the credibility of scientists, who seem to change their mind with bewildering regularity whether the subject is the danger of dioxin or...
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