A Nevada man discovered his DNA had changed after a bone marrow transplant and had been replaced, in part, by that of his German donor. Chris Long, from Reno, found that not only had his blood swapped, but his semen was also changed, following his treatment for leukemia. Long, who works at Washoe County Sheriff’s Department, told The New York Times: ‘I thought that it was pretty incredible... 

A team of scientists has grown embryos inside a sheep that contain human stem cells, moving the sci-fi idea of developing human organs inside animals one step closer to reality, which has sparked ethical concerns. The scientific breakthrough could potentially save the lives of thousands of people who are in a dire need of vital organ transplants. While many patients die before they move up to the...