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This experiment is about contaminiation. Learners will model the process of verifying clean on a macroscopic level by using a small Secchi (se-key) disk and will read about how the Secchi disk is used in environmental science and compare this with the liquid particle counter that is used in the Genesis cleanroom. Includes a teacher's guide and students handouts. This lesson 5 of 10 from the Dynamic Design: The Cleanroom module.