I think there are way too many places for me to know for sure [where this story came from], but I did grow up in the fifties and sixties, when the fear of The Bomb, was at its height. I also grew up on numerous science fiction and monster stories about creatures created by radiation and so on.

“The idea came to me like a bolt of lightning. I’d been researching technological singularity, and started to wonder, what would happen to us, if we all uploaded at the same time? Would the density of our consciousness create a gravitational singularity, and if so, would we be hastening our own end, rather than avoiding it?”

In “Travelers,” Robert Silverberg has created a future where travel between planets is the entirety of many people’s lives, people no more rooted in place than a zephyr or tornado. Without restrictions like health issues, life span or economics, the humans in this future can enjoy jaunting across galaxies the way twenty-first century oil barons enjoy island-hopping in the Caribbean. It can be a hedonistic lifestyle—or it can be a way to expand one’s horizons, ever-deepening one’s understanding of humanity through exposure to The Other: other people, other cultures, other worlds.

“I think empathy is crucial to being human and one of the skills that we don’t teach, but should. I am always, sadly, amazed at our ability to rationalize treating other living beings with discourtesy and our willingness to accept things like the deceptively named term “collateral damage” in warfare.”

A few years back I was working on a project to look at the feasibility of interstellar probes. I arrived at this conclusion: the real key to any sort of a probe that could reach nearby stars using propulsion technologies which we could plausibly see in the near future was that the probe itself had to be as small as it could possibly be. That led me to a lot of thinking on the order of how small could you really go. How sophisticated could you actually make a small spaceship?

I ended up first with Arighan’s Flower, because I figured wiping out whole ancestral lines would be a pretty big threat. I also knew from the beginning that I wanted the gun to be one of a set. … One of my beta readers actually wanted this story to be about five times as long as it is right now, and to follow that kind of structure, detailing Shiron’s adventures with each gun. Quite probably it would have been a good story, but it wouldn’t have been the story I wanted to tell.

Published in 1985, “More Than the Sum of His Parts” was set in the then-distant future of 2058. “It seemed a reasonable time frame, when we were somewhat more optimistic about space industrialization,” Haldeman says, “although the waldo technology is wishful thinking, or arm-waving—I didn’t have any actual technological rationale for it happening that soon, or ever. The waldos themselves were inspired by the story ‘Waldo,’ by Robert Heinlein. The idea of smaller and smaller waldos building their miniaturized successors came from the notions about self-replicating ‘von Neumann’ machines that were cutting-edge techno-dreaming at the time.”

This is a post-poverty utopia where everybody lucky enough to be plugged into the society’s opportunities—the passengers or if you prefer “pilots” of the arvies—gets to do whatever the heck they want to do with their lives, indulging their slightest whims via the bodies whose wombs they occupy. I left unexplained what criteria determine who gets to enjoy all of this world’s vast opportunities and who becomes an enslaved recreational vehicle; that decision is made, from standards you and I can only guess at, long before any fetus is granted the gift of adult awareness. There must also be genetic and medical issues involved far beyond us. But no doubt, if some zygote possesses genetic gifts that promise vast talent in athletic pursuits, that’s a quality that would render their future body very very much in demand as athletic gear for some fetus interested in enjoying the ride from the safety of the amniotic fluid.

“I had a story I really wanted to tell about a child being raised in isolation, ignorant of an apocalyptic infection raging in the outside world, so my approach to ‘Patient Zero’ was probably something like ‘A spoonful of science helps the narrative go down.'”