The European: What possibilities for human enhancement do you see as especially promising and as least problematic, so that we should actually take concrete steps into their direction?
Bostrom: I think it would be great, for example, if we could develop a least some mild cognitive enhancements that give us a bit more mental energy or combat diseases like Alzheimer’s. In general, though, the difficulties of enhancing the capacities of a healthy human being may have been underestimated. Humans are very complex evolved systems. If we begin to tinker with that and don’t know what we are doing, we are likely to mess up and cause side effects that might only become evident much later.
Read the rest of the interview here.