The recrystallization of supersaturated solutions is pretty amazing to observe. When a solution that has had more solute dissolved at a higher temperature is now cooled, it becomes supersaturated at the lower temperature. Because that supersaturated solution holds more solute than is stable at the lower temperature, crystals start to form.

A real life example of a super saturated solution is sweet tea with sugar added while the tea is hot. When the tea cools down it can hold more dissolved sugar than it could if sugar was added when it was cold.
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