When I was at the thrift shop a couple of weeks ago I picked up some science texts from different grades to get an idea of what I could be doing with Catherine and Harry. There were 3, Grade 1, Grade 3 and a Grade 7 or 8. I flipped through them yesterday and I'm already sure I wasted my quarters. Every book contained the same information as the one before. Every book covered habitats, photosynthesis and ecosystems. Every book had the same insipid text and uninspiring pictures. It honestly looked like a calculated attempt over the spans of 8 years to drain any interest in the natural world out of children.
We'll stick with our National Geographic books. I've also got a college biology text which, again, covers all the same material as the other three but with better language so we'll use that when we need to.