User blog comment:ProfessorMcG/Time Travel. Is it possible?/@comment-1483327-20100813123151

I believe that nano-machines (or "nanites") should only be used to repair otherwise inoperable tumours and incurable diseases. Using nanites to simply prolong life past a normal human lifespan just seem imoral to me. But there is nothing imoral in curing a disease that would cut down promising people way before their time.