About the 90% argument, that's false. I looked into it one time and it turned out it's just a misread wording that "psychics" use to their advantages. As it turns out, it's not that 90% of the brain is unoccupied or unknown to science, it's just that some sections of our brain do not function at the same time to avoid an "overload", which is where the "missing" 90% of the brain comes in. At this point in science every part of the brain is known to have at least one basic function or purpose.