Okay, a huge while back someone suggested that men stop developing artificial wombs, and I just wanted to beg them to reconsider (If technology can do it for me, that would be great).
Also, are we saying change the nature of A man, or of Men in general?
Because I think personal epiphanies (whether they're brought about by religious experience, a close up view of the horrors of war, the love of a good woman/man/cat/rosebush/etc, or the act of becoming a parent) certainly can change the nature of person. I think introspection combined with sheer force of will can change a man. And I think that almost all major changes in adult individuals come about from a combination of both external and internal forces.
Humankind, however, seems to require impetus for change from both external and internal forces as well (albeit they tend to be major technological advances, philosophical and social movements, epidemics, natural disasters, tyranny, etc). My question on the subject is where does societal change originate? With individuals, or with the majority?