When it comes to genius, the only possibilities are that it is something innate in people, or it is something to do with their upbringing. It is hard to imagine how simply bringing someone up in a certain way would be enough to turn them into a Mozart or a Shakespeare or an Einstein. Mozart after all was writing complex music as a young child; it is difficult to explain how environment could have had such a significant influence by the age of five. It must therefore be the case that genius is something that is wholly innate.