The overwhelming scientific consensus, backed by satellite imagery, gravitational physics, and centuries of empirical observation from circumnavigation to space missions, drives the 99.3% market-implied probability against a flat Earth. Traders treat this as settled fact rather than cultural debate, with no recent developments shifting the narrative despite occasional social media memes or conspiracy content that briefly surfaces in pop culture. Historical patterns of flat-Earth claims gaining fringe attention have never altered the core evidence, keeping the outcome firmly resolved in traders' eyes. Realistic upset scenarios remain negligible, as any shift would require unprecedented global re-education or fabricated data contradicting all verifiable metrics.