Using live bessbugs and petri plate "sleds," students observe and quantify the pulling power of a bess beetle. Are bess beetles stronger than humans? Is my bess beetle stronger than yours? This hands-on activity is sure to generate excitement in your classroom. Students gather data by weighing objects and calculating the pulling power of the bess beetle. Includes 4 bess beetles, petri plates, string, tape, and 200 "pennyweight" washers. Ideal for individual science projects, demonstrations, or up to 8 students working in pairs. Cannot be shipped to CA.