Is the brain more or less active during sleep? What is the purpose of brain research? Why do some people remember their dreams and others do not? What effect does cyanide have on the brain? What happens in the brain with ALS? How do brain cells communicate with each other? Are there people or animals with more or fewer than two brain hemispheres? Is dopamine good for you and serotonin bad? Why do brain tissues have different colours? How are memories made in the brain?