What causes Alzheimer’s disease? Can you feel pain in your brain? Why do Dutch people say “I have sawdust in my head” when they do something stupid? How do brain cells communicate with each other? How can I find out which stage of cognitive decline I am in, and how can I prevent Alzheimer’s disease or dementia? Are there people or animals with more or fewer than two brain hemispheres? Why are you grumpy after a bad night of sleep? Can you distinguish between people who are visual or auditory learners? How is it that some people see an object as blue, while others say that same object is green? Can you unlearn sleeping in the dark?