Have you ever wondered why we use soap to wash our hands?
Try this simple experiment at home to show how important it is to wash your hands with soap.
Soap contains surfactants which help to lift bacteria and microbes from the skin and push them away. The water then washes the loose bacteria away leaving your hands cleaner
Listen to the full podcast of Nanogirl's Great Science Adventures on www.rnz.co.nz/nanogirl
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