Thanks everyone, these suggestions look great - I am especially excited about the stephen hawking book, I had no idea he was writing for kids, that is very cool. I described that one to ds and he sounded pretty into it.
And myth-o-mania seems up his alley as well - I am making a nice list for the library!

We have definitely checked out Captain Underpants - They are one of ds's favs! And he has been literally sleeping with various Calvin compilations for the last year or so. I think he could live on comic strips alone, but I really want him to read things with a beginning middle and end, but maybe that's silly at this stage.
I will ask the teacher what she thinks is best or desired for the assignment, too.

Val, I am not at all familiar with Uncle Scrooge, I will google that one for sure....
thanks again everyone!!