Wow, I am so happy to see your post today. I don't post much but was coming here to ask a very similar question. My DS sounds very much like yours - loves science, great speller, easy As. I don't really see that he is very challenged at school and not sure how to handle it. He's such a happy go lucky kid that he doesn't complain but I know he would enjoy school so much more if he was pushed harder. We will find him up at 6:45 on Sat am, reading his Social Studies book! From comments from his teacher, it seems it's pretty much assumed he will always get high grades.
So I have no answers but you're not alone! I don't know if home projects would help or if finding an alternative educational path is right for him. It is very frustrating to see him ready to learn and not given anything at school to allow him that chance to really explore.
