The most intense controversy this year has been: Korean researcher Hwang disappoints in an investigation aimed at cloning human embryos. Well, Hwang's research, analyzed closely at the Boston Children's Hospital and the Harvard Stem Cell Institute, has taken a big step: human stem cells did not get them by transfer of the nucleus, as he claimed, but yes, although he did not realize, by parthenogenesis, that is, from unfertilized eggs.