Dolphin in the Sky

I have never been interested in non-fiction children's books, but I know that for the sake of Happy Boy's education I ought to read them to him.

Recently we checked out a book on dolphins from the library. I didn't know how much Happy Boy absorbed from me reading it to him but I now know it is more than I thought. Yesterday as we were going for a walk an airplane flew overhead. He said, "Look! That airplane has flippers just like a dolphin and a dorsal fin, too!" I never thought if it like that before, but he is right.