Every Nigerian child has the constitutional right to free and compulsory primary education, and free secondary education, yet there remains a huge gap between that law and the reality. One in every five of the world’s out-of-school children lives in Nigeria. In a nation with one of the world’s youngest populations, this lack of access to education could potentially cost the country its future. Its government recently acknowledged that there are 10.5 million children not being educated. It’s a complex picture which includes underfunding, a lack of skilled teachers - and an issue of safety. BBC Africa journalist Yemisi Adegoke hears from parents and students at the sharp end of this crisis and asks the difficult questions to those in power.