What goes wrong in the brain when I lose focus? How can I find out which stage of cognitive decline I am in, and how can I prevent Alzheimer’s disease or dementia? Can I learn from a text by listening to it while I sleep?  What causes Alzheimer’s disease? Are there people or animals with more or fewer than two brain hemispheres? Why is sleep so essential? Why do people still receive electroshock therapy? How heavy was Einstein’s brain? Does the size of your brain say anything about intelligence? What is already known about long covid and the brain? Do colours appear the same to everyone?