Real genius is usually narrowly focused, but smart enough to pick up a reasonably good variety of other skills, like music and languages, on the side (see Richa

Real genius is usually narrowly focused, but smart enough to pick up a reasonably good variety of other skills, like music and languages, on the side (see Richard Feynman for a good example). But you do not become a real expert without lots of dedicated practice, and if you are dividing your serious practice time between multiple subjects, you will never become really good at any one. Richard Feynman's "Surely You're Joking, Mr Feynman!" and "What Do You Care What Other People Think?" and Jagdish Mehra's biography of Feynman, The Beat of a Different Drum all show the combination of focus on physics and his ability to easily pick up the side interests, safecracking, drawing, drumming, Mayan arithmetic, that exemplifies real genius.