What is already known about long covid and the brain? How does music affect mental health? Can you unlearn sleeping in the dark? Why do brain tissues have different colours? Are there people or animals with more or fewer than two brain hemispheres? Do colours appear the same to everyone? Why don’t we use stem cell therapy for MS? What goes wrong in the brain when I lose focus? Did the gigantic dinosaurs also have gigantic brains and a gigantic number of neurons? How does personality arise? And does it change over the course of your life?