Over a long enough timespan, the probability that you will experience some form of cancer essentially goes to 1. We tend to die young, of violence, malnutritio

Over a long enough timespan, the probability that you will experience some form of cancer essentially goes to 1. We tend to die young, of violence, malnutrition, and disease, a whole lot less often than we ever used to. Aside from the really obvious tumors, even detecting most cancers is a relatively new technique. So my hypothesis is that, historically, people died off before they broke down and developed cancers, or, if they lived long enough, either died with their cancers or because their immune systems were weakened enough that something else got them first.