Why is the pig's tail so short?

People upstairs ask why it is short, not why it rotates. The correct answer is this: an ancient legend, a long time ago: anonymous ate a tied pig's tail at a regular dinner of the tribe. Consciously or unintentionally, I remembered a curious habit that I didn't know when I started to develop: tying a knot on the tail of the prey I participated in catching. It seems that at today's dinner, I undoubtedly participated in the capture of this pig! In an atmosphere full of admiration and approval, this is almost a celebration dinner: ah! ..... Anonymous suddenly roared. No one knows what happened. They all stood up and looked at each other stupidly ... amazing! People have such a magical function: memory! People have such a magical function: recording! Since then, the function of pigtail-knotting notes, as a great scientific and cultural innovation, has been widely spread and applied in human social and cultural life. It is said that eight ropes were usually used to record different things at that time. Each rope can tie up to three knots, and the position of the knots is also different. Obviously, the quantity of this thing is expressed in binary. It is estimated that eight ropes were used for the same reason. For the convenience of carrying, put it on with a belt and tie it around your waist. This is also beneficial to the functional sequence identification of BaSheng. As for this "eight-rope belt", adding some beautiful leaves as decoration is something to come.