Although concepts belonging to the field of epidemiology are used mainly in the study of infectious diseases, they are also relevant to the study of other maladies including mental illnesses. Jonathan speaks with Cambridge PhD student Tomáš Formánek about his ongoing research in the intriguing field of ‘psychiatric epidemiology’. – Although there is a large consensus among climate scientists that C02 emissions are a significant factor in the earth's current warming cycle, not all scientists agree. Jonathan asks Alexander Ač, a scientist who takes the consensus view, why he thinks it is that a considerable number of highly qualified climate scientists continue to dispute it.