After most of the sewing machine technology had been developed, Elias, who was stuck on the smallest sewing technology, spent many sleepless nights, and one night he dreamed that he was caught by a bunch of savages, who demanded that he quickly make a sewing machine. I woke up seeing something strange. When he woke up, he remembered that the tip of the spear had a hole in it, so he made a sewing machine needle with a hole in it, and the sewing machine was made. And we know that a similar story happened to Mendeleev. It is believed that this happens because when a person works very hard and devotes himself, the work he is loading brings out the inner and secret resources of the human brain. In general, any breakthrough comes with a lot of hard work, and at this time, the most mysterious and unexplained part of the human being is helped by the subconscious, even through dreams.