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INSIDER - The human body replaces millions of cells every day. Here's how much skin blood and saliva it can

INSIDER - The human body replaces millions of cells every day. Here's how much skin blood and saliva it can

  • TV-G
  • 2019
  • 5mins
The average lifespan for Americans is 78.5 years. Over that time the human body goes on a remarkable journey. To stay alive the human body needs to reproduce grow and adapt. But just how much skin is replaced? How much salvia is swallowed? and how fast do fingernails actually grow?