The most contentious issue in current debates about human enhancement is whether it properly belongs to human aspiration to outstrip our human ceiling in cognition and longevity so radically that the result would not be improved human beings but instead "posthumans." Transhumanists answer strongly in the affirmative and hence vigorously support our directing available and foreseeable technologies to that end. According to Nick Bostrom, transhumanism is "an outgrowth of secular humanism and the Enlightenment." Our "ceasing to be human is [not] (...) in any way problematic" as long as we are "replaced by something better".Of the two main lines of technological approach that... (shrink)