Why do children outperform adults in the game of ‘concentration’? Why do Dutch people say “I have sawdust in my head” when they do something stupid? How can I find out which stage of cognitive decline I am in, and how can I prevent Alzheimer’s disease or dementia? What happens in the brain with ALS? What happens when you have a blackout during an exam? What happens in the brain when you take psychedelics? What is fainting? Why don’t we use stem cell therapy for MS? Why is sleep so essential? What happens in the brain when you feel ‘confused’?