What goes wrong in the brain when I lose focus? Why do some people remember their dreams and others do not? How does personality arise? And does it change over the course of your life? Is dopamine good for you and serotonin bad? What is the impact of speaking multiple languages on the brain? Why are you grumpy after a bad night of sleep? What is the ‘brain freeze’ sensation when eating or drinking something cold? What is fainting? How is it that some people see an object as blue, while others say that same object is green? How does your brain know that you want to move?