Any Republicans who think the stem-cell breakthrough gets them off the hook are going to end up very unhappy. This issue will not go away.

First, even the scientists who achieved the latest success believe strongly that embryonic-stem-cell research should continue. No one knows for sure whether the new method of producing pluripotent cells will pan out or where the next big developments will come from. We are still many thresholds away from anything that can be of practical value to me and others. Scientifically, it makes no sense to abandon any promising avenue just because another has opened up.

Second, even if this were a true turning point in stem-cell research, people like me are not going to quickly forget those six lost years. I am 56. Last year I had a kind of brain surgery that dramatically reduces the symptoms of Parkinson's. It received government approval only five years ago. Every year that goes by, science opens new doors, and every year, as you get older and your symptoms perhaps get worse, doors get shut. Six years of delay in a field moving as fast as stem-cell research means a lot of people for whom doors may not open until it is time for them to shut.

Third, although the political dilemma that stem cells pose for politicians is real enough, the moral dilemma is not and never was. The embryos used in stem-cell research come from fertility clinics, which otherwise would discard them. This has been a powerful argument in favor of such research. Why let these embryos go to waste? But a more important point is, What about fertility clinics themselves? In vitro fertilization ("test-tube babies") involves the purposeful creation of multiple embryos, knowing and intending that most of them either will die after implantation in the womb or, if not implanted, will be discarded or frozen indefinitely. Even if all embryonic-stem-cell research stopped tomorrow, this far larger mass slaughter of embryos would continue. There is no political effort to stop it. Bush even praised in vitro fertilization in his 2001 speech about the horrors of stem-cell research. In vitro has become too popular for politicians to take on. But their failure to do so makes a mockery of their alleged agony over embryonic stem cells.