Students act as environmental engineers involved with the cleanup of a toxic spill. Using bioremediation as the process, students select which bacteria they will use to eat up a spilled pollutant. Students learn how engineers use bioremediation to make organisms degrade harmful chemicals. Engineers must make sure these "good" bacteria have everything they need to live so they can degrade contaminants for bioremediation to occur. Students learn about the needs of living things by setting up an experiment with yeast.