Right and Left brain

 The idea that the right side of the body and left brain are connected to happiness comes from traditional Chinese and Eastern medical philosophies. According to this viewpoint, the right side of the body is associated with yin energy, which is seen as a calming and nourishing force. The left brain, on the other hand, is regarded as the "yang" side of the brain responsible for rational and analytical thinking. It is believed that a balance between these two energy forces is necessary for physical and mental well-being and happiness.