Is there a link between rheumatoid arthritis and anxiety? Can I learn from a text by listening to it while I sleep?  How do brain cells communicate with each other? Is dopamine good for you and serotonin bad? Why do people still receive electroshock therapy? What is the ‘brain freeze’ sensation when eating or drinking something cold? How is a neuron made?  Are emotions experienced in the heart or the brain? Did the gigantic dinosaurs also have gigantic brains and a gigantic number of neurons? How can I find out which stage of cognitive decline I am in, and how can I prevent Alzheimer’s disease or dementia?