Of the several ways in which a demonstration can be given, a teacher-centered demonstration is seldom the best way because it does not provide enough stu dent involvement. When students participate actively in giving a demonstration, they are more interested and, consequently, learn more. Several types of stu dent-participative demonstrations are shown in the Appendix, for example, "Discovery Demonstration: Bottle and Key," p. 437; "How Long Can You Boil Water in a Paper Cup?" p: 442; "Discovery Demonstration: Inquiring into Falling Bodies," p. 447; "Small Group Problem solving," p. 453; "Evaluation of Student Understanding of a Basic Physical Principle," p. 443; and "Genetic Engineering: A Splice of Life," p. 397 Here are five ways in which a demonstration can be presented.