Metabolism! The stuff our body does to keep us rolling down the road! Powered by our hearts!

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Some scientists say all animals have a fixed number of heart beats before we die (955,787,040, to be exact).

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While not always true, metabolism (and heart rate) generally correlates with lifespan. Animals with slow beats live longer. Be still, our hearts—or at least slow down!

 

Check our facts: 

http://www.sjsu.edu/faculty/watkins/longevity.htm
http://jn.nutrition.org/content/132/6/1583S.full

Heart Rate Sources:
The Complete Dinosaur
The Cardio Research Web Project
Electrocardiographic studies of the three-toed sloth, Bradypus variegatus
Squirrel = Super Soldier? WIRED Online
Cheetah Facts
Wikipedia!
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Illustrations by Hoot and Brad Berkner, a master craftsman of multimedia. Check out more of his work at http://www.bradberkner.com/ and follow him on Twitter @bberkner.