How are memories made in the brain? Can you unlearn sleeping in the dark? Why do some people remember their dreams and others do not? Is the brain more or less active during sleep? Is there a link between rheumatoid arthritis and anxiety? Why is some information stored so quickly in the brain, while other information takes much longer? Why do people still receive electroshock therapy? Are there people or animals with more or fewer than two brain hemispheres? How does music affect mental health? How is it that some people see an object as blue, while others say that same object is green?