Ten years ago, South Korean geneticist Woo Suk Hwang made big news, twice. First, scientists heralded him for creating a population of stem cells from human embryos, which scientists had hoped could eventually go into personalized stem cell therapies. Then, Hwang hit the headlines again when investigations found that he made up the data in two of his landmark papers. It's unlikely the cells he made were true clones, although he maintains they were. In addition, his students told reporters they donated their own eggs for Hwang's experiments—a scenario ethicists discourage, because students might feel pressured by their mentors to "donate" to the cause.