The human brain is divided into two hemispheres, and the left hemisphere is responsible for all activities on the right side. Generally, the left hemisphere has functions such as language, concepts, numbers, analysis and logical reasoning. The right hemisphere is responsible for all activities on the left side, and the right brain has the functions of music, painting, space geometry, imagination, synthesis and so on. Brain cells that understand mathematics and language are concentrated in the left hemisphere; Brain cells that show emotion and appreciate art are concentrated in the right hemisphere. Many people are used to doing things with their right hands, eating and writing with their right hands. Few people use their left hand. I am one of these few people. I have been eating with my left hand since I was a child. It is said that the right brain that eats with the left hand is more developed and smarter, but I am not that smart.