What is already known about long covid and the brain? How is it that some people see an object as blue, while others say that same object is green? What causes Alzheimer’s disease? How does music affect mental health? How is it possible that we can hear either ‘green needle’ or ‘brainstorm’ whilst the audio fragment remains the same? Why do some people remember things better than other people? Why do people still receive electroshock therapy? Does neuroscience provide better explanations for behaviour than psychology? What is fainting? Are there people or animals with more or fewer than two brain hemispheres?