 We go about our daily lives as though harms with very low probability are not going to occur, effectively treating low probability harms as zero probability events. To this extent, we are not Bayesians about the risks of daily life. We treat some possible harms as impossible for the purposes of getting through the day. This attitude, crucial to living our lives, does not imply that there are no serious risks in daily life. The fact that our attitude toward the risks of everyday life is justified by its ability to help us to get through the day undermines its ability to provide an ethical justification for exposing research participants to the same risks in the context of non-beneficial research (Ross &amp; Nelson 2006).