Grinity - I have to agree. There was no avenue for DS to even show his abstract thinking. It really is skill mastery at this level. And unfortunately, my DS wasn't a computation whiz like many gifties which is more readily obvious and measurable and I think more to impress elementary school folk. there's no opportunity for theorizing about the nature of shape of galaxies due to the presence of super-black holes at their center due to his knowledge of gravity influencing the shapes of planets.