Liminal LivesEmbryo adoptions, stem cells capable of transforming into any cell in the human body, intra and inter species organ transplantationthese and other biomedical advances have unsettled ideas of what it means to be human, of when life begins and ends. In the first study to consider the cultural impact of the medical transformation of the entire human life span, Susan Merrill Squier argues that fictionparticularly science fictionserves as a space where