I am in awe.
Consider a leaf sunbathing. We learned what it is doing when we were nine — the diagram, the arrows going in one side and out the other — and then we stopped thinking about it.
Look a little closer.
Inside every cell there are stacks of green discs, piled like coins somebody set down and forgot. Inside each disc, one membrane folded back on itself again and again, layer on layer, until the folding is most of what is there. Spread across all that folded surface, in their millions, are the traps. Each one is hundreds of catchers around one center. Every one of them set. Every one waiting for something it will meet exactly once.
Then the energy arrives, eight and a half minutes out from the sun. That is all that arrives; there is nothing to hold. One trap shuts on it.
What happens next is a shiver. Something moves, and the thing beside it moves, and it goes off through the folded dark faster than anything in a leaf has any business moving. At the far end of that shiver, a molecule of water comes apart.
The leaf keeps one part and lets the other go. Then it pulls carbon out of the air, sets it against the part it kept, and closes them together into something solid enough to weigh and sweet enough to taste: sugar. A few minutes ago, that sugar was a beam of light.
And the green you are looking at is the light that got away. It takes the red out of the daylight, and the blue, and most of what is left as well. What you see is the small remainder. Every leaf you have ever seen is the color of the light it failed to catch.
The plant moves some of that sugar into the base of its flower and holds it there. A few drops of nectar.
A bird comes. It weighs almost nothing. It drinks the sugar and burns it in the muscles of its wings, and it beats those wings fast enough to hold itself motionless in open air — the body hanging there, the wings gone into a blur.
So the bird is hovering on sunlight. Most living things run on fuel they put away days ago; this one runs on what it drank minutes ago, burning it almost as fast as it arrives. Nothing is stored in between. The sun, the leaf, the flower, the wing — and no gap anywhere along it.
None of it was arranged quickly, and neither the leaf nor the bird meant to.
And it is silent. It is going on outside your window, in every living green thing out there, while you read this.
The same patience created a mouse.
There was one in our office this week. I never saw it, but I know it was there.
Our floor goes quiet in stages. The phones stop. Two people finish a conversation by the elevators that could have waited until morning. The cleaners come through. Then the lights step down to the half-power the building keeps overnight, and there is nobody in it — desks and dark screens and chairs pushed in at the angles that record how each person left.
The building keeps working. Air moves through the ducts on a schedule nobody is awake to notice. The refrigerator cycles. An elevator returns to the lobby and waits with nothing to carry.
Somewhere in those hours, the mouse came out.
Someone had set a trap by the kitchenette. A tray of glue, with something sweet in the middle of it.
It stepped on.
I am not going to describe the next few hours. What I keep returning to is the room. Whatever happened in it took the time it took, and the building went on exactly as before. The ducts kept their schedule. The refrigerator cycled. The elevator waited in the lobby with its doors open.
The mouse died in the dark, and nothing there knew it had.
Maintenance found it in the morning.
Now consider what was in the trap.
A heart the size of a pea, beating five or six hundred times a minute. Fast enough that if you held it in your palm you would feel not a pulse but a hum.
Lungs working on air that was first breathed out by microbes more than two billion years ago, and that has not run out because somewhere, right now, grass is still making more.
Iron in the blood. Every atom of it was forged inside a star that lived and died before there was an Earth for it to fall on.
And a line. From that mouse back through its mother, and her mother, and every mother before her, generation upon generation, without one single failure to reproduce, for something close to four billion years. Not one break. Not one. Had there been a break anywhere along it, there would have been no mouse in the trap.
Now follow your own line back the same way. Mother to mother, without a gap, as far as it goes.
The two lines meet.
Not as a figure of speech. Somewhere between seventy-five and ninety million years ago there is a small animal, shrew-like, warm-blooded, awake at night, and living on insects, in a world still run by dinosaurs. It is the direct ancestor of that mouse and of you, and of everyone you have ever loved.
The mouse's heart and blood and fear were already there, in that animal. You are looking at a cousin. A distant one, and a small one, but the word is accurate and there is no other word that is.
Four billion years, and it ends beside a refrigerator.
But it was, of course, just a mouse.
That is the sentence. Three words, and they do all the work. Once you have said just a mouse, the trap costs nothing. It is not cruelty. It is not even carelessness. It is building maintenance.
I do not know what that mouse felt. I do not know whether it understood what was happening to it, or whether understanding is the right word for what goes on behind those eyes. I will say that I do not know, in these pages, more than once.
What I do know is what it was made of. Adrenaline is adrenaline. The same molecule in a mouse as in me, fitting the same receptors — and it was old long before either of us arrived to need it. Whatever ran through that small body that night was not a different substance from what runs through mine when I am afraid.
And I know that just a mouse is not a description. It is a permission slip. Everything we have learned in four hundred years of looking has made that slip harder to sign, not easier.
We were warned about this. Take the world apart to see how it works, we were told, and you will find gears, and the wonder will drain out through the seams.
It has not happened. Not once. Every time we have opened something up, what was inside was larger than what we thought we were opening.
Science has never looked upon the natural world and made it less astonishing.
I have felt this in a church and I have felt it under a microscope, and I have never been able to tell the two feelings apart. Both start in the same place: someone wanting to know what is actually true. The believer asks what is true. So does the scientist. The further science has carried me into the natural world, the closer it has brought me toward the possibility of a creator — and that is the room I am writing from. You are welcome here, whatever room you are in yourself. Nothing in these pages asks you to leave it.
You cannot be argued into caring about the living world. Nobody was ever reasoned into loving something.
Love comes from proximity. From being near a living thing long enough to notice that it was busy — that it had its own afternoon, its own difficulties, somewhere it was going that had nothing to do with you.
Most of us are handed that chance early, and briefly. If you ever sat still at the edge of a forest as a child, or watched an ant colony conducting its business across a slab of concrete, or held something small and warm and felt it breathing against your hands, you learned something that does not come out again.
A child will never grow up and defend a world they do not love.
The chance does not only come early. That is the mercy here. The attention can be picked up at any age, on any regular afternoon, by anyone willing to stand still for longer than is comfortable. Nobody is too late.
We are one thread in the most astonishing structure in the universe: The Web of Life. We did not ask to be the ones who could see the whole of it. We are. What follows is an invitation to look — and a warning, because whatever we agree not to look at is whatever we end up permitting.
The mouse was in the trap for a reason. Someone put it there, and that someone was not cruel. Cruelty would have required thinking about it. Nobody in that building did.
I went and looked, after I was told. There is a gap under the kitchenette cabinet where the panel does not quite meet the floor. A quarter of an inch, less in places. You would never see it unless you had a reason to look. That is the door. It was always there. I have stood at that counter a hundred times waiting for coffee with my back to it.
Everything in this account was trying to stay alive. The leaf holding its face to the light. The bird spending the sugar as fast as it can drink it. The mouse going along the wall in the dark, because the middle of the floor is where things get caught.
That is what we have in common with all of it. It is the oldest work on this planet, four billion years in, and nothing alive has ever been excused from it.
The mouse was doing it too. That is all it was doing when it stepped onto the glue.