Learn how to do the best hand washing science experiment for kids! Let your children see for themselves the importance of soap and how it gets our hands clean. This simple soap and pepper experiment takes 1 minute to set up, but kids will remember the impact for much longer. (And it is easy to do over and over!) You only need three things- soap, pepper, and water! Get the full scientific explanation on how this experiment works. Perfect for human body themes and learning about germ theory. Preschool, prek, and kindergarten love this STEM activity! Homeschool science or in the preschool classroom, you must do this STEM project! Science activity for kids, science project for kids. STEM challenge about germs and pepper and soap experiment. Team-Cartwright.com