What is the ‘brain freeze’ sensation when eating or drinking something cold? When are we able to solve MS? What effect does cyanide have on the brain? How can I find out which stage of cognitive decline I am in, and how can I prevent Alzheimer’s disease or dementia? How do brain cells communicate with each other? How does stress affect your brain? Do we really have a reptile brain, a mammal brain, and a human brain inside our heads? Is the brain more or less active during sleep? Are there people or animals with more or fewer than two brain hemispheres? What happens in the brain when you feel ‘confused’?