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Many germs spread by our hands, and often times, people don't wash their hands well enough to get rid of germs.

Learners discover that soap can be used to power a boat. Learners make a simple, flat boat model, put it in water, and then add a drop of detergent at the back of the boat.

In this activity, learners create a large film of soap and experiment with what can and cannot pass through it.