all those crazy science fiction materials with bizarre properties used to explain how the space travel gets around the laws of science.
contrivium is infinitely strong, lightweight, a room temperature superconductor, heatproof, and constantly emits high energy B.S. particles that can be used as a source of almost limitless energy.
engineer: "oh no! an engineering problem! what will we do?"
other engineer: "just build it out of contrivium!"
engineer: "oh yeah I forgot about that!"