It is a common urban legend that has been around for many years that people use ten percent of their brains. Because of this legend, false attributions have been made about many people, including Albert Einstein. It is believed that a person can control this supposedly unused part of his brain and increase his intelligence. After new experiences, it has been observed that there are changes in gray and white matter in the brain, but what exactly these changes are has not been proven. The idea that a large part of the brain cannot be used and can be activated at will is not scientifically correct. This idea is based solely on folk tales. While there are still many mysteries about brain function, brain mapping techniques suggest that all parts of the brain are a function.