Is the brain more or less active during sleep? Can you unlearn sleeping in the dark? What is the impact of speaking multiple languages on the brain? Is there a link between rheumatoid arthritis and anxiety? What is fainting? Why is it easier to learn a language as a kid? Why don’t we use stem cell therapy for MS? How do brain cells communicate with each other? How does personality arise? And does it change over the course of your life? Can you distinguish between people who are visual or auditory learners?