Mammal's hearts will all beat about a billion times in their life. So a mouse that lives around 4 years will have a faster heart rate then an elephant that lives for 70. But they will both get their billion heart beats in. Except for humans. We have learned to alter our lifespans to the degree that we will get 3x that number. Each of us getting 3,000,000,000 beats should we live to our potential.
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