Why are you grumpy after a bad night of sleep? Why do Dutch people say “I have sawdust in my head” when they do something stupid? Why don’t we use stem cell therapy for MS? Which brain region is the most important? How does speaking multiple languages impact the brain? Why do brain tissues have different colours? Do colours appear the same to everyone? What is fainting? Can you unlearn sleeping in the dark? Can you feel pain in your brain?