1. Simple model captures the key mechanics of hand-washing  News-Medical.net
  2. Wash your hands for 20 seconds: Physics shows why  Phys.org
  3. Health: You should ALWAYS wash your hands for at least 20 seconds, mathematical model reveals  Daily Mail
  4. Here's why you need to wash your hands for 20 seconds, according to physics  Livescience.com
  5. View Full coverage on Google News

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