10% of brain myth
The 10% of brain myth is the widely perpetuated urban legend that most or all humans only make use of 10 percent (or some other small percentage) of their brains. It has been misattributed to people including Albert Einstein. By association, it is suggested that a person may harness this unused potential and increase intelligence.
Though factors of intelligence can increase with training, the idea that large parts of the brain remain unused, and could subsequently be "activated" for conscious use, is without foundation. Although many mysteries regarding brain function remain, every part of the brain has a known function.