Didi listens in the deliciously warm water as her grandmother explains.

"When Sol developed cyber tech all those years ago," Emily says, one hand dangling in the bubbles, "he naturally tested it on himself to ensure its safety. His adaptations evolved and defined him, creating the technology that ultimately extended his life and made gunslingers possible."

That much Didi was already aware of thanks to Alfred and Elian. "But why, if he's enhanced, did the Galactic ...