While lecturing to his students on backscatter analysis, Charlie finds a strange chunk of code embedded in the program he is discussing. The numbers in the coded message correspond to letters of the alphabet and warn him that "WE R WAITING FOR U."
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.