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Introduction: Huang Xinjie, a farmer in Fugou, Henan Province, has made a fortune by selling eggs in recent years In the spring of 2001, although his eggs were fresh, big and cheap, no one cared It turns out that because many customers bought the "head photo eggs" of the chicken farm, which "affected" the fresh eggs of his family, his business was also cold Then, Huang Xinjie suddenly thought, and he marked the "birthday" of each fresh egg The eggs that can't be sold after the specified time will not be sold again In order to reassure the customers, he also gave each customer a copy of his own ID card, and wrote on the back of the home phone and the number of eggs he bought If any quality problem is found, he can be found to make compensation at any time After the eggs are marked with "birthday", customers are scrambling to buy his "birthday" eggs