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According to @aaronjmars, Polymarket's Paris weather prediction market has recently been suspected of physical manipulation.
A user exploited an unattended Météo France temperature sensor near the runway at Paris Charles de Gaulle Airport (CDG), briefly raising the ambient temperature around the sensor using a portable heating device (suspected to be a hairdryer).
The user purchased prediction outcomes with extremely low prices and very low probabilities (such as the temperature reaching 22°C) twice on April 6 and April 15, then caused the sensor readings to spike through physical interference, triggering the market to determine their victory, resulting in a total profit of about $34,000.
Subsequently, the French meteorological agency discovered the incident and filed charges against the individual.