S: Our nation is becoming too averse to risk. We boycott any food reported to contain a toxic chemical, even though the risk, as a mathematical ratio, might be minimal. With this mentality, Columbus would never have sailed west. T: A risk-taker in one context can be risk-averse in another: the same person can drive recklessly, but refuse to eat food not grown organically. T responds to S by showing that ['risk cannot be defined in relation to perceived probable benefit', 'a distinction should be made between avoidable and unavoidable risks', 'to risk cannot be reliably assessed without reference to context', 'mathematical odds concerning risk give an unwarranted impression of precision']