Immortality is actually an act of longing for the body function to remain unchanged, but as a living human, how can the body function remain in a state for thousands of years? As a person with modern scientific knowledge, everyone should know that this is impossible, but people in Qin Shihuang's time did not understand this scientific knowledge, so this wishful thinking is actually impossible. And it may be possible for science and technology to do this in the future, but at the time of Qin Shihuang, the level of science and technology was not even taken into account. At that time, the level of science and technology was less than one tenth of today's. Immortality is to change the biological science of human body, rather than simply preparing an elixir. Therefore, during the Qin Shihuang period, even gunpowder could not be made, let alone the elixir of life. People in the past didn't have corresponding biological science knowledge. They not only didn't understand scientific knowledge, but even misunderstood it. This knowledge reserve is far from enough, even a junior high school student can't compare with it, let alone develop this product of Genesis.
In addition, the human body itself is experiencing birth, aging, disease and death. No matter who you are, you should be aware of the gradual aging and decline of your body. This is essential, so how can this human natural law be reversed? This law is not only applicable to human beings, all living things in this world are the same, and they will grow old and die, so don't expect to live forever. As long as you can use your limited life and keep exercising, it is the key to longevity. Immortality is impossible.