What is the impact of speaking multiple languages on the brain? What happens in the brain with ALS? Are emotions experienced in the heart or the brain? Is there a link between rheumatoid arthritis and anxiety? How do brain cells communicate with each other? Why do some people remember their dreams and others do not? Why is sleep so essential? How are memories made in the brain? Is dopamine good for you and serotonin bad? What causes Alzheimer’s disease?