By Randal Coombs
As temperatures continued plummet in South Dakota, USA, this man tried an unusual experiment to see how cold it really was.
Justin Frantzen soaked his t-shirt in boiling water in February 14 and left it outside, to see how quickly it would freeze.
With temperatures dropping to as low as -18°C, the shirt did not take long to stiffen up.
20 minutes later, the top was solid to the touch and even stood up unassisted.
Justin said: “I soaked this shirt in hot water… Set it outside in the bitter cold and in 20 minutes it was froze!”