I don't usually read. I also like the clear explanations of words that are hard to understand. Some of the books had a lot of blood in them and some talked about political stuff. All of my grades I got from this book were A's and B's. They are so interesting.
Some parts are funny and some parts are serious.
I also think the pictures are neat. Your books are a lot better than regular textbooks. They are fun to read but you learn a lot from them. It was as if we were really there. I went to visit each of them and got lots of helpful suggestions.