What is the ‘brain freeze’ sensation when eating or drinking something cold? How is it that some people see an object as blue, while others say that same object is green? Why do some people remember things better than other people? Is dopamine good for you and serotonin bad? What is the effect of a visual impairment on the brain? And is there anything we can do to restore it? Can I learn from a text by listening to it while I sleep?  Why are you grumpy after a bad night of sleep? How does personality arise? And does it change over the course of your life? Can you feel pain in your brain? How can I find out which stage of cognitive decline I am in, and how can I prevent Alzheimer’s disease or dementia?