Why are you grumpy after a bad night of sleep? How do brain cells communicate with each other? Is it true that you can be ‘left-brained’ or ‘right-brained’? Why is some information stored so quickly in the brain, while other information takes much longer? How does personality arise? And does it change over the course of your life? What happens in the brain with ALS? Are there people or animals with more or fewer than two brain hemispheres? What is the effect of a visual impairment on the brain? And is there anything we can do to restore it? Is the brain more or less active during sleep? Do we only use 10% of our brain?