“What is a man? Is he defined by things like morphology or longevity? If form alters content—that is, if the shape of the container fundamentally influences what it contains—what will it mean to society if a man no longer resembles a man? If those things which have always driven us—birth, aging and death—are altered or eliminated, will it make us into something new? If a man need not fear death, will that make us more human than our ancestors, or less?"