You should also avoid using books too early in the terminology or give away information students could discover on their own, It is important for students to have opportunities yo construct meaning and articulate ideas in their own words before being introduced to scientific vocabulary. 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 own hypotheses about why certain objects are attracted to magnets. Then, students compare their hypotheses to the information presented in the nonfiction book magnets and nonmagnetic. They are also introduced to the terms magnetic and nonmagnetic at this point.