Through modifying genes, we can cure many genetic diseases that make doctors helpless. At the same time, we can break through the innate limitations of human beings, such as height, intelligence, even mental state, etc.. However, when the disease decreases, the quality of life will naturally improve. When we have a good quality of life, our life span will be prolonged naturally. These studies on genes can help us understand the mystery of genes and heredity<br>
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