In this laboratory activity, learners design an experiment to evaluate how environmental factors influence the growth of molds. Suggested questions to investigate include: (1) Does mold grow faster at cold temperatures or at warm temperatures? (2) Does mold grow faster in the light or in the dark? (3) Can mold grow on a substance that does not contain water? Young learners would have fun with this activity, but would need help completing the charts. All learners should get adult permission before doing this activity, since some people are allergic to mold.