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I was reading this week an article by Bryan Doyle. It talks about hummingbirds.

Hummingbirds have race car hearts that eat oxygen at an eye-popping rate. Their hearts are built of thinner, leaner fibers than ours. Their arteries are stiffer and more taut. Their hearts are stripped to the skin for the war against gravity and inertia, the mad search for food, the insane idea of flight.

They are tiny little birds and their hearts beat 10 times a second. So even if you put your huge ear to its chest, it would be hard to discern the heartbeat.

The price of their ambition is a life closer to death; they suffer more heart attacks and aneurysms and ruptures than any other living creature. It’s expensive to fly. You burn out. You fry the machine. You melt the engine.

The biggest heart in the world is inside the blue whale. It weighs more than seven tons. It’s as big as a room. It is a room, with four chambers. A child could walk around it, head high, bending only to step through the valves. The valves are as big as the swinging doors in a saloon. This house of a heart drives a creature a hundred feet long.

Every creature on earth has approximately two billion ...

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