On this day in 1998, two researchers affiliated with the University of Massachusetts drew worldwide attention when they went public with a birth announcement. The new arrivals, named Charlie and George, were genetically-identical Holstein calves. They were produced by new techniques that involved splicing human genes onto cow DNA and then cloning the animals. By cloning an already genetically-altered cow, the UMass team's research could result in a genetically-engineered herd with the potential to produce therapeutically altered milk in large enough quantities to be useful in creating drugs to treat human disease. Less famous than Dolly, the sheep cloned in Scotland, the UMass cows represented a great step forward in the effort to develop medicines using farm animals.