Are emotions experienced in the heart or the brain? Why don’t we use stem cell therapy for MS? Why do Dutch people say “I have sawdust in my head” when they do something stupid? What causes Alzheimer’s disease? What happens when you have a blackout during an exam? Why are you grumpy after a bad night of sleep? How does personality arise? And does it change over the course of your life? Is the brain more or less active during sleep? How does speaking multiple languages impact the brain? Why do some people remember things better than other people?