books.google.com - It's the Science Fair, and the second grade is all over it! Some kids are making man-eating robots. Some kids are holding their breath for a very, very long time. Some kids are doing interesting things with vacuum cleaners. The theme, obviously, is global warming. But what should Ivy and Bean do? Something...http://books.google.com/books/about/Ivy_and_Bean_What_s_the_Big_Idea.html?id=Km-1VUmLsx4C&q=rope&utm_source=gb-gplus-shareIvy and Bean What's the Big Idea?