... so in a literal way, men rule the world.  And this made sense a thousand years ago because human beings lived then in a world in which physical strength was the most important attribute for survival.  The physically stronger person was more likely to lead and men in general are physically stronger.  Of course, there are many exceptions.  But today we live in a vastly different world.  The person more likely to lead is not the physically stronger person.  It is the more creative person, the more intelligent person, the more innovative person.  And there are no hormones for those attributes.

-- Chimamanda Ngozi Adichie