Nonfiction books, therefore, are most appropriate to use in the explain phase only after students have had these opportunities. For example, in the explain phase of Chapter 13 (“That Magnetic Dog), students first develop and share their own hypotheses about why certain objects are attracted to magnets. Then, students compare their hypotheses to the information presented in the nonfiction book Magnetic and Nonmagnetic. They are also introduced to the terms magnetic and nonmagnetic at this point.