One remark I have is that my experience with DS is consistent with Howler and squishys' observations that their children advanced quickly in the early years in science. It seems like children who grasp the scientific method and abstract concepts intuitively can accelerate quite quickly to middle school(and above) material in early elementary. I borrow books on science topics in the 9-12 range from the library often and scaffold DS on the language side. He needs more richness than that provided by material targeted at the K/early elementary set.

What is to give light must endure burning.