the key issue is whether the topic is enjoyed by the user, not the difficulty.
obviously sdemjanenko is enjoying his experience and the other kid is not.
besides difficulty is all in the eye of the beholder or the skill of the teacher.
anything can be explained in an elementary way by someone who understands it.
there is nothing difficult about algebraic topology if it is selectively presented by some one who likes it.
i have taught euler characteristics to 2nd graders, by handing out cardboard polyhedra and letting them color them, and count the facets.
one of those children, now grown up, is an aeronautical engineer.
there was an 11 year old named lenny eng, in my 12 year old son's summer math class at duke tip. lenny loved pure math and is now a famous mathematician of some kind. But my son wanted to do something else.
actually he enjoyed the well - taught summer program at duke, but when he got home i tried to cram more down his throat than he wanted.
the whole matter concerns extracurricular activities that are enjoyed and self chosen, versus those that are force fed.
unfortunately parenting is not something we all get adequately trained for.
