What is the impact of speaking multiple languages on the brain? How do brain cells communicate with each other? Which brain region is the most important? Do the male and female brain differ? How can I find out which stage of cognitive decline I am in, and how can I prevent Alzheimer’s disease or dementia? Do colours appear the same to everyone? Is the brain more or less active during sleep? How does speaking multiple languages impact the brain? How is it that some people see an object as blue, while others say that same object is green? What happens in the brain when you take psychedelics?