Definitely w/ you on grade-level just fine for output and funny how so far it's all boys!!! My 1st grader is doing 3-4th grade chemistry, and I have him write until he's tired and then I finish. And for experiments, i write the list of items and the hypothesis and experiment design for both boys. I have them write the summary. For my 1st grader, he narrates to me, I write it down, and he copies it. For my 4th grader, we took several Bravewriter classes, he has three finished pieces that came out very nice so I consider that a good year of writing!
I do wonder how some kids handle 2-3 grade level skips. How do they handle that amount of writing!
My 1st grader is interested in genetic engineering so we'll include that as part of science.
