Is it possible for a human to have an abnormally fast growth of brain size and development leading to a fully grown adult brain before say age 15 or even 10? If so are there cases like this and what happened to them? Is this how child prodigee comes about? Or is child prodigee usually good at a small range of things but the rest of the brain is still not fully grown. So unusual in one part of the brain only? I am interested in cases where the whole brain has grown abnormally fast.