Stem cell research continues to advance:
Scientists have previously shown that embryonic tissue transplants can be used to grow new kidneys inside rats. In their latest study, though, they put the new kidneys to an unprecedented and critical test, removing the rat's original kidneys and placing the new kidneys in position to take over for them. The new kidneys were able to successfully sustain the rats for a short time.
Creepy, but potentially life-saving research.