There is also such a small story about pins: once, our country held a conference on research and creation. At the meeting, Japanese creationists went to the rostrum, took out a song to tighten the needle, and raised a question at the same time. He asked, "How many uses are these paper clip?" A Chinese scholar present at that time said there were more than 30 kinds. Murakami himself proved that there were more than 300 kinds. Everyone applauded him warmly. At this moment, someone handed a note to the audience, which wrote: I will make a point tomorrow to prove that these paper clip have hundreds of millions of purposes. This man is Xu Guotai. The scheme he proposed was later called magic Ball phenomenon. According to his argument, paper clip can make various weights because of the same weight; As a metal, paper clip can produce many reactions with various acids and other chemicals; paper clip can be changed into 1, 2, 3, 4, 5, 6, 7, 8, 9 and addition, subtraction, multiplication and division; Can be changed into English, Latin, and Russian letters, so, paper clip of the things that can be expressed in all languages in the world can be expressed. In addition, paper clip metal can also conduct electricity and have magnetic reaction in the magnetic field; In art, straightening it can play the role of strings; It can also be used as clips, ropes, lanyard, necklace......