Humanity's future was uncertain, but this much I knew: any action I took would ripple out across the eons to have enormous impact.

Entire posthuman civilizations millions of years hence would rise and fall on the choices made by me, now, in the present.

Evolution, I realized, is not an impersonal force. You and I are participating in it at this very moment.

You and I are the butterflies, flapping our wings, only dimly aware of the hurricanes we're setting in motion.

And not one of us is insignificant.