How are memories made in the brain? Why are you grumpy after a bad night of sleep? Do you learn faster when you’re younger? Why (not)? Are there people or animals with more or fewer than two brain hemispheres? Do colours appear the same to everyone? Why is sleep so essential? Why do people still receive electroshock therapy? How does speaking multiple languages impact the brain? Why don’t we use stem cell therapy for MS? Which brain region is the most important?