![]() ![]() And yet here's your heart, doing its job all the time, one beat after the next, all the way up to three billion. Three billion years, and life itself barely exists. Count back three billion hours, and modern humans don't exist-just wild-eyed cave people, all hairy and grunting. I was thinking about that, trying to imagine a number that large. Turton says that if you lived to be eighty years old, your heart would beat three billion times. Jellyfish don't even have hearts, of course-no heart, no brain, no bone, no blood. Like a ghost heart-a heart you can see right through, right into some other world where everything you ever lost has gone to hide. It's their pulse, the way they contract swiftly, then release. It doesn't matter what kind: the blood-red Atolla with its flashing siren lights, the frilly flower hat variety, or the near-transparent moon jelly, Aurelia aurita. A JELLYFISH, IF YOU WATCH IT LONG ENOUGH, begins to look like a heart beating. ![]()
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