For this experiment/demonstration, 1 teaspoon of active dry yeast (store-bought) was dissolved in half a cup of warm water in a beaker and allowed to rest for at least 5 minutes. In an Erlenmeyer flask, a small amount of dish soap, 10 mL of 3-12% hydrogen peroxide (CVS), and food colorings of students' choices were added. Finally, the yeast solution was poured into the Erlenmeyer flask to initiate the reaction (Figure ). The massive fizz produced by the reaction was entertaining to the students. In discussions that followed, students were explained the fact that catalase enzyme responsible for this experiment is the same type found in potatoes in the previous experiment. Finally, we explained to students how catalase enzyme also clears out highly reactive H2O2 and protects cells in humans and animals. Overall, through the two catalase-based experiments, students were introduced to the presence of metals in the enzymes of potatoes (plants), yeast (fungi), and animals.