Why Are 10.5 Million Nigerian Children Out-of-School?

I am not a doomsday prophetess, but a disaster is brewing menacingly under our noses and if we are not careful, our children whose futures we myopically think may be secured are going to be the ones to combat this disaster.  What is this disaster and how does it threaten our children? The disaster is the 10.5 million Nigerian children who are currently out-of-school. When we read via IFTTT