Why do Dutch people say “I have sawdust in my head” when they do something stupid? Why do some people remember things better than other people? Why is it easier to learn a language as a kid? Why is sleep so essential? How is it possible that we can hear either ‘green needle’ or ‘brainstorm’ whilst the audio fragment remains the same? How is it that some people see an object as blue, while others say that same object is green? How does personality arise? And does it change over the course of your life? How does music affect mental health? Do the male and female brain differ? What goes wrong in the brain when I lose focus?