With the world population recently surpassing seven billion people, it is critical for students to consider how such growth can lead to limited resources. Both the idea of diminishing resources and the magnitude of enormous numbers can be difficult for children (and many adults) to fully comprehend. For this particular lesson, the authors chose to…

Describes a teaching method that actively involves elementary school children in science lessons by having them teach lessons to their peers. Gives examples of teacher and student strategies. Describes evaluation of the students and student progress with time. Reviews depth of thinking and questioning by students in this activity. (CW)