An individual reportedly used a hair dryer to manipulate a weather sensor in Paris, influencing a Polymarket prediction market and allegedly netting $34,000, according to Le Monde. The tampering allegedly inflated temperature readings, affecting the outcome of a market tracking Paris's highest temperature on April 19. This incident highlights vulnerabilities in prediction markets reliant on single data sources. French authorities are investigating the anomaly, which underscores the risks of manipulation in markets dependent on real-world data feeds. The case raises questions about the integrity of oracle systems and the need for redundant data sources to prevent similar incidents in the future. Polymarket has not yet commented on the allegations.