Are there people or animals with more or fewer than two brain hemispheres? Is the brain more or less active during sleep? How does speaking multiple languages impact the brain? What happens in the brain when you feel ‘confused’? Is dopamine good for you and serotonin bad? How does your brain know that you want to move? Do the male and female brain differ? How are memories made in the brain? How is it that some people see an object as blue, while others say that same object is green? What happens in the brain when you take psychedelics?