In this video segment from Teaching Elementary Life Science, teacher Jo Hannah Katz leads a group discussion with her second-grade students about their investigation of soil and earthworms. The students respond to her questions about the purpose of the investigation and the reasons soil and worms are important. Katz notes that group discussion encourages students to think about the questions she asks. She also says that it is more valuable to allow students to develop their own ideas and understanding than to receive knowledge from the teacher.