How do brain cells communicate with each other? What is the ‘brain freeze’ sensation when eating or drinking something cold? How are memories made in the brain? Are there people or animals with more or fewer than two brain hemispheres? Is dopamine good for you and serotonin bad? Why is some information stored so quickly in the brain, while other information takes much longer? How heavy was Einstein’s brain? Does the size of your brain say anything about intelligence? What is fainting? Do colours appear the same to everyone? Do we only use 10% of our brain?