What goes wrong in the brain when I lose focus? What is already known about long covid and the brain? How are memories made in the brain? What is the impact of speaking multiple languages on the brain? What is the ‘brain freeze’ sensation when eating or drinking something cold? Is dopamine good for you and serotonin bad? How heavy was Einstein’s brain? Does the size of your brain say anything about intelligence? Can I learn from a text by listening to it while I sleep?  Why is some information stored so quickly in the brain, while other information takes much longer? Why is sleep so essential?