In the second of my “socially distanced” episodes, I talk to geologist Marcia Bjornerud at her home in Wisconsin, who says that the coronavirus pandemic is a reminder that, throughout all of geologic time, microbes have been in charge. We talk about viruses, what odd entities they are, the curious role they have played in evolution, and we muse over the possible long-term effects of the dramatic changes to our lives and culture this virus has wrought.