The discussion of “designer babies” often revolves around gender or hair color, but the medical debate is far more complicated. Should we screen embryos for disease or other genetic modifications? These considerations raise ethical questions and call into question the validity of surrounding research. The lack of regulation and oversight make this particular biotechnology frightening to some, while the potential for disease eradicating techniques excites others. But how far is too far? What are the major scientific and ethical hurdles to assuage the skeptics? Underwritten by Booz Allen Hamilton Nita A. Farahany, James Bennet, Marcy Darnovsky