Hi UM
I think you got some good recommendations here - especially if DK is not an option. But curious, I just went through DS library, everything that isn't brainwaves, DK, Usbourne, MacCaulay or Horrible Science is subject specific. I would recommend moving to the subject section of the library and get picture books - the next levels up from the magic school bus books. There are also the Ology books, those are sort of science and fantasy combined. THe Oceanology one was quite nice.

DeHe