The human body replaces millions of cells every day. Here’s how much skin, blood, and saliva it can produce in a lifetime.

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?

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