Wait there was a xkcd comic about that: http://xkcd.com/605/ http://xkcd.com/605/ Speaking of 'necessity as the mother of invention' were there any research on

Wait there was a xkcd comic about that: http://xkcd.com/605/ http://xkcd.com/605/ Speaking of 'necessity as the mother of invention' were there any research on how to increase birth rate? I remember something about Russia increasing it's birth rate, but I don't remember how.