Scientific consensus from physics, astronomy, and space exploration underpins the 99.3% implied probability on "No" for the Earth being flat, with traders recognizing centuries of verified data including satellite imagery, gravitational measurements, and orbital missions as decisive. Public fascination with flat-Earth ideas persists in niche online communities and occasional pop culture moments, yet these remain fringe without credible institutional backing or empirical support. The market reflects skin-in-the-game wisdom that overwhelmingly favors established science over conspiracy narratives. Realistic upset scenarios would require unprecedented revelations overturning all observational evidence, such as a global cover-up exposed at scale, though no credible developments point to such an outcome.