The 93% mentioned is far beyond the expectations of most. Prior to the 20th century (at least in the upper class) a child was taught every thing from Greek and Latin to water color painting without regard to 'talent'. Examine the life of Ada Augusta. While there is no doubt that she was talented, her studies were not predicated on that talent. Today most people foreclose on what they might become accomplished at because they say things like 'I can't draw a straight line' or 'whistle a note' or similar such. Again they have no understanding of just how good that 93% level is. I can't teach you to engrave as well as Rembrandt, but I can teach you to engrave as well as the majority of professionals.