The power of science and medicine proves to be extraordinary once again. Scientists announced that they have created the first successful human-animal hybrids. The project proves that human cells can be introduced into a non-human organism, survive, and even grow inside a host animal, in this case, pigs.This pig embryo was injected with human cells early in its development and grew to be four weeks old. Indeed, the debate over the technology is a mixed bag of difficult issues, but this could be a game-changer in terms of organ transplants in coming decades!