I just started a new audio book, Scale, by Geoffrey West. I learned that almost all life forms have an average of about 1.5 billion heartbeats in their lives. Mice have faster heart rates, and die sooner as a result. Turtles and whales live over 100 years with their slower heartbeats. But fast or slow, it seems animals end up with about the same number of beats if they live a full life.

I find statistics like this fascinating. How is it that this is a constant when so many other factors come into play, and when so many evolutionary traits went in different directions? Trunks, blow holes, shells, horns, fins, arms, wings, marsupial tails, all evolve with different purposes, but our many sized hearts all give our different species the same amount of beats.

We may not have the same appendages, we may be all different sizes and shapes, and we all have different amount of time on this planet… but all our mechanical clocks tick the same number of times. Amazing!