How is it that some people see an object as blue, while others say that same object is green? How do brain cells communicate with each other? When are we able to solve MS? Can brain implants read and control our minds? Is the brain more or less active during sleep? Is there a link between rheumatoid arthritis and anxiety? Why do some people remember things better than other people? What is fainting? What causes Alzheimer’s disease? Can a brain scan show whether people are already producing their language response while their conversation partner is still speaking?