‘Using other fields’ looks at the connections between philosophy and other fields of systemic enquiry, from psychology and history to physics, economics, and computer science. Reading history is the closest we get to conducting experiments in politics, creating theories of political philosophy. Social anthropology helps us understand different cultures, beliefs, and arguments. Linguistics matters, as language is the essential medium of philosophy and looking for valid patterns across words helps us to assess philosophical experiments. Connections and messages in computer science, hypotheses in economics and mathematics, and perceptions in the sciences, all combine to inform our understanding of philosophy.