When an ATF officer apparently commits suicide in her house, the sound of the gunshot was recorded from multiple sources, creating an "acoustic fingerprint" of the room and its contents. Charlie recreates this acoustic fingerprint, and by understanding how bats "see" using sonar, he is able to determine that something is missing from the room.
Before the Activity
Download the attached PDF and look over the Teacher Page.
During the Activity
Discuss the materials from the Student Page with your class.
After the Activity
Encourage students to explore web sites and questions from the Extensions page.