Medical science has changed the face of the planet - increasing life expectancy and improving people's quality of life. It's only 2017, but in this century we've already been able to successfully grow organs in labs and carry out face transplants.
What's more is that these are only two of the many breakthroughs which have been made in the 21st century. However, the latest medical development is not only remarkable but, until recently, was thought to be biologically impossible.
The world's first head transplant has been successfully carried out.
Yes, you read that right. In the not-so-distant future, we could be living in a world where the body of our dreams is nothing more than operation away. It turns out that Mary Shelley predicted the future when she imagined Frankenstein's Monster in 1817.
Well, maybe not Frankenstein's Monster. There are huge ethical implications associated with head transplants. A person could be left psychologically damaged by the procedure, and you'd assume that living donors would have to be completely outlawed.
The first head transplants were carried out on rats, who only lived for a few hours after the procedure.
Which is what makes this story even more remarkable. Watch the video to see how they achieved it...
The grueling head 18-hour transplant took place in China. The operation was carried out by the controversial Dr. Xiaoping Ren, who hit the headlines last year after transplanting a head onto a monkey's body.
If you are brave enough, then click over to the next page to see the photographs from the pioneering surgery...