THE ORIGINAL NATS HAD BEEN DEVELOPED IN THE WORKSHOPS OF Arjuna Expeditions in Seattle and launched into space shortly before Zero, where they had crawled around on the surface of Amalthea under the eye of Eve Dinah. Later, during the first two years of the Epic, the original design had been modified to work on, and in, ice. Every child knew the story of how such nats had been used, first to bring Ymir to rendezvous with Izzy, then to merge those two objects into Endurance . As such, nats resonated more strongly in Blue culture than in Red, but they were used on both sides of the turnpikes. Or to be more precise, both cultures used a vast family tree of species and subspecies of nat, all descended from the first Arjuna model and all sharing, to a greater or lesser degree, the code base originally created by programmers like Larz Hoedemaeker and Eve Dinah. The number of different uses to which nats, and swarms thereof, had been put over the millennia was uncountable. They were as ubiquitous and as various as hammers and knives had been pre-Zero.