In late 2025 the Rule-based Epidemiology Modellings ↗ began to consider the wider context of their work. On the one hand, the techniques of epidemiology save lives at scale, but on the other, emerging diseases and newer health-related epidemics are accelerating. We asked: ”How can a scholar quickly grasp epidemiology basics?” This resulted in my paper discovering epidemiology .
Beginning with what epidemiology is not, we see how disease management saved millions of lives from about 1950. Epidemiology matured through the 20th century but stalled in the early 21st. It became clear that epidemiology was in- sufficient, so political consensus was found to expand the scientific scope to One Health. One Health treats ecology, animals and humans as a system of systems across dozens of science fields, using the language of epidemiology. The newly-refocused World Health Organisation is committed to get 2030 global health goals back on track with a One Health approach, with further millions of lives at stake. Many new One Health scientists and scholars are not epidemiologists, and this paper is for them.
