Is the brain more or less active during sleep? Why do Dutch people say “I have sawdust in my head” when they do something stupid? Can you distinguish between people who are visual or auditory learners? What is fainting? Which brain region is the most important? Does a 14T MRI scanner make more noise than a 3T MRI scanner? Do colours appear the same to everyone? What is already known about long covid and the brain? How does our brain create a 3D world? Is this possible with just one eye? What is the impact of speaking multiple languages on the brain?