Why does every mammal get 1 billion heartbeats in their life?
Veritasium
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Summiz
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Why Does Every Mammal Get 1 Billion Heartbeats in Their Life? explains how metabolic rate scales with body mass via Kleiber’s Law and fractal circulatory networks, showing why heart rate and lifespan balance to about a billion beats; except in humans, extended by modern medicine.


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