Could low-level exposure to polluting chemicals be analogous to exercise -- a beneficial source of stress that strengthens the body? Some scientists studying the phenomenon of hormesis (beneficial or stimulatory effects caused by low-dose exposure to toxic substances) claim that that this may be the case. Is A Little Pollution Good For You? critically examines the current evidence for hormesis. In the process, it highlights the range of methodological and interpretive judgments involved in environmental research: choices about what questions to ask and how to study them, decisions...