How does speaking multiple languages impact the brain? Why is sleep so essential? Do we only use 10% of our brain? Why are you grumpy after a bad night of sleep? What happens in the brain when you feel ‘confused’? Is dopamine good for you and serotonin bad? Are there people or animals with more or fewer than two brain hemispheres? How does personality arise? And does it change over the course of your life? Do colours appear the same to everyone? Does neuroscience provide better explanations for behaviour than psychology?