You're right, unless you would somehow ensure that of the 3 kids every mother has, 2.5 are female ;-) Anyway, looking at the worlds' population right now, I do

You're right, unless you would somehow ensure that of the 3 kids every mother has, 2.5 are female ;-) Anyway, looking at the worlds' population right now, I don't think we have to be afraid mankind will go extinct anytime soon because not enough children are born.