But we should note a subtle yet important shift that occurs when we focus on acceptable risks rather than on health and safety. Risks can be defined as the probability of harm, and relative risks would entail comparing the probabilities of harm involved in various activities. Thus, both risks and relative risks are things that can be determined by scientists who compile and measure data. It is an easy step from this to certain conclusions about acceptable risks. If it can be determined that the probability of harm involved in a specific activity is equal to or less than the probability of harm of some more common activity, then it would be easy to conclude that this activity faces an acceptable level of risk. In turn, this suggests that determining an activity as safe (in the sense of involv¬ing an acceptable level of risk) is something that can be determined by experts rather than the individuals involved in facing the risks.