How to skillfully peel cooked eggs?

Pay attention to observation when cooking eggs. Take out the eggs immediately after cooking, and then quickly put them in cold water. After a few minutes, the eggs are cold and the eggshells can be easily peeled off. The principle is that eggs expand when heated and contract when cooled. Because the eggshell is very thin, the change will be small, and the internal change will be great, and it will be separated from the eggshell after contraction.