When Dolly the cloned sheep fell victim to premature aging, lung disease and osteoarthritis, that triggered many fears. Is cloning safe? Would her fellow clones also meet an early end? Apparently, you can relax. A University of Nottingham study shows that four of Dolly's genomic clones (Daisy, Debbie, Denise and Dianna) are healthy, with no conditions that suggest they're aging too quickly. Some showed early signs of osteoarthritis, but that's normal for their advanced age. In short: cloning, if all goes well, is safe.