Reference article: Facts about soap and the importance of washing your hands.
When and How to Wash Your Hands, Handwashing
Hand Sanitizers: How Effective Are They?
What It's Like Showering Without Soap for Two Weeks
Why does soap make things clean?, Why do we use soap to wash away dirt and grime and how it works? Read more
How Does Soap Work? - The English Soap Company
Soap in America: A Brief History [Plus Science Experiments]
Hand washing. How do soap and water clean your hands?
DIY Bar Soap: 5 Ways To Make Homemade Bars of Soap Super Hard
Bar Soap Vs. Body Wash: Which is Better for the Health of Your Skin?
How Soap Works – Science Experiment - PrepareCenter
How To Use Clay In Natural Handmade Soap – Part 2 – Hazelrock House
Why didn't people use soap until recently (like, say, after the industrial revolution)? - Quora
Why Soap Works - The New York Times
Goat Milk Soap Benefits – Bend Soap Company
