What is already known about long covid and the brain? What is the ‘brain freeze’ sensation when eating or drinking something cold? Can you distinguish between people who are visual or auditory learners? Is dopamine good for you and serotonin bad? How heavy was Einstein’s brain? Does the size of your brain say anything about intelligence? What happens in the brain when you take psychedelics? How does stress affect your brain? Why do some people remember things better than other people? How is it that some people see an object as blue, while others say that same object is green? Why don’t we use stem cell therapy for MS?