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You have millions of bacteria living on your skin! While some are harmless, others can cause illness. It's often said that one of the most effective ways to prevent the spread of illness is washing hands with soap and water - is this really true? Use this complete bacteria project kit to find out. With the included materials and instructions, you'll grow bacteria from your hands and test the effectiveness of three different types of soap. Includes agar, petri dishes, sterile swabs, and more. You provide the soap samples.