Back when it was no more than a cheesy science-fiction plot device, human cloning seemed like something that would eventually be revealed to a horrified world full-blown and fully grown--a monstrous carnival apparition ("The Amazing Cloned Boy!") out of a medical freak show.
It hasn't quite turned out that way. Cloning has been emerging gradually, over the past decade, in small increments. Each advance has been startling enough, prompting ethical debates, cautionary references to Aldous Huxley's brave new world and calls for restrictive legislation. But there have been so many milestones, starting even before the birth of Dolly the sheep...