"Most of your posts make me think that you think, Robert, that when students don't learn, they can't learn."
I don't think I have ever said anything like that, I am usually a bit more specific. When you say learn, do you mean learn arithmetic? Algebra? Quantum Mechanics?
I said that there is a distribution in ability, which would include the ability to learn. And that is not the only distribution at play, there is also a distribution in the "want" to learn.
My posts on here have been mainly geared toward one thing, providing rich and authentic math classes, especially algebra and beyond, to students. Classes such that if an (actual) engineer or mathematician were to gaze upon the work and results they would be pleased by the genuiness in the treatment of the subject.
And I know, for whatever reason, most students are not prepared for such classes. If it is your claim that you can prepare all kids for such classes then that would be a plus because, as far as I can tell, we have these crappy clases because of the inclusion of kids not remotely able to take them in their genuine form.