“The races I study still employ their immune systems, and the parallels between those systems and us as a race are striking. For we have become what Earthlings would call white blood cells. We remove foreign bodies from the cosmos. And every one leaves an imprint, a bauble of tech or a new idea, all of which we neatly coil into our lives, into our molecular structure. We are an immune system, and we are immune to death. This last, alas, is our curse.”
