According to the basic laws of thermodynamics, if you take a warm apple pie out of the oven and place it on a window sill, it will eventually cool to be the same temperature as the surrounding air.
But physicists have discovered that under certain circumstances, charged particles called ions don’t follow this logic - in fact, they end up cooling to two entirely different temperatures.
“This apparent departure from the familiar laws of thermodynamics is akin to our warm apple pie either cooling as expected, or spontaneously bursting into flames, depending on the pie’s exact temperature when it is placed in the window,” says one of the team, Eric Hudson, from the University of California, Los Angeles.
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