In the classic fairy tale movie The Wizard of Oz, the Tin Man who had no heart and thus was unable to love left a deep impression on the audience. The little Tin Man is certainly pitiful, but modern science and technology can indeed install an "artificial heart" for people. A British patient with a metal heart implant passed away at the age of 68 after spending 7 years in tranquility. Nowadays, life science is so amazing that humans can not only produce organs like the heart, liver, and kidney to extend life, but even the origin of life - the uterus can be man-made!