Focuses on research by Jeffrey Charuk and colleagues, of the University of Toronto, on nonylphenol ethoxylate. The substance, known as nonoxynol, finding its way into the human body and food chain; Findings reported in the 1998 issue of `American Journal of Physiology'; Mention of the relationship of nonoxynol to the 1970s discovery of Canadian scientist Victor Ling on P-glycoprotein and resistant cancer cells.