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CDC: Handwashing: Clean Hands Save Lives
UC David Health: Coronavirus prevention: 4 things to know
Northeastern: Here's why washing your hand with soap for 20 seconds protects you from COVID-19
BBC: Coronavirus: How to wash your hands - in 20 seconds
The Atlantic: 20 Seconds to Optimize Hand Wellness
Healthcare In Europe: Study shows: Hand washing is key against COVID-19
Mayo Clinic: Hand-washing is an easy way to prevent infection.
Mayo Clinic: Want to prevent illness? Hand-washing can help
Whas: The Science of Soap
Daily Mail: Wash your hands more often for 20 seconds