Every year at my school, we do a Science Expo. This year my classmates and I had to create solo experiments. I decided to ask the question: “what is the best way to wash your hands?” My hypothesis was: Adults washing their hands for 30 seconds with bar soap will have the best results. I started by getting some petri dishes from amazon and designing my experiment. For my experiment I had my family rub their hands in my kitchen sink. When they were done, I had them wash their hands for 10 or 30 seconds, with liquid or bar soap. I then used steralized qutips to swab their hands.

Then I rubbed the swabbed qutips in my petri dishes. I also swabbed my kitchen sink for my control. I took pictures of the bacteria growth in my petri dishes every day. I did some reseach on whether bar or liquid soap was better. According to my research, liquid soap is more expensive and worse for the environment. Bar soap is more environmentally-friendly and is 3x cheaper than liquid soap. The conclusion for my experiment is: kids wash their hands better than adults with bar soap for 30 seconds. I suggest you wash your hands for 20-30 second with bar soap.

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