An anion enhances the body’s condition, exhausted from studying by increasing the activity of the brain's alpha waves, and is effective for improvement of a student's concentration.These days, most students breathe and study in closed spaces along with TVs, computers, and radios.These electronic products have high energy, such as X-ray, R-ray and ionizing radiation, along with ultraviolet rays, which generate positive ions in the air.When the number of positive ions increase, diseases including asthma, bronchitis, headache, shoulder pain, nervous breakdowns, high tension, enervation and depression can be caused.However, an anion is the elemental factor with a negative electrical charge of the air, neutralizes harmless cation, clears blood, promotes nervous stability and recovery from fatigue, improvement of appetite and activation of cells, and enables vibrant learning. When far-infrared rays penetrate into the human body, invisible heat action is generated and promotes fomentation effect, expansion of capillaries, and blood circulation effects.Anions increase the alpha waves in the human brain, relieve tension and change acidity to alkali, as well as increase volition, help nervous stability, and recovery from exhaustion.For recovery of fatigue from sports activities, sore muscles, those who use computers often, and those who have pain on their wrists and shoulders... As a result of measurement, anions have been confirmed to be effective in increasing the activity of alpha waves, enhancing the body’s condition, and improving concentration ability! The heat generated from a human's body is indicated by blood passing under the skin.When the rate of blood flow increases, temperature goes up, and when the rate of blood flow decreases, the body’s temperature goes down.The increase of the rate of blood flow means that blood circulation becomes relatively better.In this case, we can see blood circulation is evenly carried out.