Why is it easier to learn a language as a kid? What is already known about long covid and the brain? Do the male and female brain differ? How is a neuron made?  How does music affect mental health? What is the purpose of brain research? What is the impact of speaking multiple languages on the brain? What happens in the brain when you take psychedelics? Why do Dutch people say “I have sawdust in my head” when they do something stupid? Are computers smarter than humans?