A wonder of a certain winter
In the past winter, the weather was cold and frozen, and water dripped into ice. A country boy came across something in the woodshed of a cottage. It was shaped like curd fat, warm and shiny, placed in the palm of his hand, and warm on the tentacles.

The child was surprised, holding it and showing it to the elders in the village. The elders also found it strange, and looked at it carefully, and saw that there was a slight change in this thing, and it seemed to be about to crack. Everyone was shocked, but they didn't know what it was.

Suddenly, a tourist in the village returned and heard it. After looking at this thing, he said: "This is the Sodium Acetate Trihydrate Hand. I have heard the words of strangers on my way to study. When this thing encounters a specific situation, it has a wonderful change." Everyone was puzzled and asked the maester for a detailed explanation.

The maester then took a purifier, placed the object in it, and heated it with a slight fire. After a while, the object gradually melted, like a clear oil. The maester then left it to stand and waited for it to cool. Then, with a light touch of his finger, in an instant, the object condensed like ice and snow, spreading rapidly from the touch of his finger, and in an instant, the whole vessel became solid and overflowed with warmth.

Everyone was amazed and asked why. The maester said: "This Sodium Acetate Trihydrate Hand is supersaturated, and when it encounters external disturbances, it crystallizes and exudes heat, so it is different." Everyone realized it, and since then, the village has regarded knowing this thing as a wonder, and has always been humane.