Troublesome law: A species cannot stop doing what it has always done. Were this not true of us, we would have rethought science by now. It is now probing territory that runs absolutely contrary to the survival interests of the species that nurtured it. Wisdom should tell us to turn away from those paths, but, as with all species, our genes push us to continue to probe our limits. Scientists will never pull back from the next step, because they can't help themselves.