What is the purpose of brain research? Do we produce new neurons in our adult brains? Or does this stop at a certain age? Why do Dutch people say “I have sawdust in my head” when they do something stupid? Did the gigantic dinosaurs also have gigantic brains and a gigantic number of neurons? Is dopamine good for you and serotonin bad? Why is sleep so essential? How does our breathing influence how we think and feel? Do some people have stronger mental imagery than others? And does this affect how they learn? What is the effect of a visual impairment on the brain? And is there anything we can do to restore it? How does personality arise? And does it change over the course of your life?