A few weeks ago, I found myself in the outskirts of Nairobi, Kenya, in Kibera and Mathare, Africa's largest slums and home to some young men and women whose world is riddled with painfully common gang and sexual violence. It's a constant struggle to access clean water, find toilets. Their families live on next to nothing, but if a student here wants to go to secondary school, the government requires they pay school fees.