Scientists point out that if you want to live a long life, you must correct the wrong idea that drinking water is to quench your thirst. If you are not thirsty, you don't need to drink water. Scientists in the United States, Japan and Russia have found that drinking cold water is better than drinking warm water. Therefore, in the past 20 years, there has been a fever of "drinking cold boiled water" all over the world. After boiling a glass of water, cover the teacup and cool it to 25℃ ~ 30℃, it becomes 1 cup of cold water. In the process of cooling boiling water into cold water, chlorine gas is reduced by 50%, and physical and chemical substances such as surface tension, density, viscosity and conductivity of water have also changed. Scientists have found that treating seeds with cold boiled water or irrigating crops can greatly increase the yield of crops; Drinking cold boiled water for animals can improve their disease resistance; People often drink cold water, which can prevent colds, pharyngitis and some skin diseases; Drinking water every morning can prevent colds, pharyngitis and some skin diseases; Drink a cup of fresh cold water at about 20℃ every morning, and gradually increase the number of cups. There will be a magical longevity effect in a few years. According to the survey of scientists, 460 elderly people over 65 drink 1 cup of cold water every morning. After five years, 82% of people are rosy, energetic and have tight teeth. They can walk 10 km every day, and no one has ever been seriously ill. Generally, drinking 8 large glasses (500ml) to 10 large glass of water a day will have obvious longevity effect. But cold boiled water should not be exposed to the air for too long, otherwise it will lose its biological activity.