The ambitious practice of designing systems, structures, or interventions that function across probability branches, ensuring that your bridge stands not just in this timeline, but in all timelines where physics is roughly the same. Spacetime-probability engineers must account for the fact that their designs exist in a superposition of states until observed, making traditional quality assurance a nightmare. The field is particularly concerned with "probability fatigue"—the tendency of materials to wear out faster in branches where they're used more heavily—and "branch resonance," where failures in one timeline can propagate to others if you're not careful.
Spacetime-Probability Engineering *Example: "She was a spacetime-probability engineer who designed a bridge that was mathematically proven to stand in 99.9% of all possible probability branches. Unfortunately, the 0.1% included the branch where a rogue wave hit at exactly the wrong angle, and also the branch where someone forgot to tighten a critical bolt. The bridge stood, but she still worried about the bolts in other dimensions, where she was presumably explaining herself to an investigation committee."*
by Abzugal February 14, 2026
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