We spoke with Prof. Sarah Brosnan about the problem of cooperation, and why it has been a conundrum for biology since the times of Charles Darwin.

Microbes are never alone. In fact, their place in a community has profound implications for their ecology and evolutionary dynamics.

Most of us grow up learning that cheating is bad. We should not steal. We should not lie. And above all: we should not exploit the groups we are part of. Is cheating irrevocably bad?