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What online betting market did someone allegedly rig with a hair dryer?

Answer: The daily temperature at a Paris airport.

Close-up of two red dice on top of a laptop keyboard to indicate online gambling.
Temperature readings at Charles de Gaulle International Airport in Paris, France, spiked twice in the last month, much higher than expected. This might not typically raise eyebrows, with the weather being the weather, but authorities thought it suspect that someone on Polymarket walked away with thousands on both occasions after betting on the changes in temperature.

The gambler in question apparently made off with a total of $34,000 from the two incidents. Polymarket pulls its data for this particular bet from a temperature sensor located on a public road at the airport. The current theory is that someone drove up to the sensor and used a battery-powered hair dryer to heat the air around it and cause the spiked reading.

The temperature sensor has since been moved to a new, presumably less accessible, location. Polymarket has not indicated whether it has required that the winnings be returned.