In one of Africa's largest slums, these girls saved to solve a problem

Dozens of young people in the Kibera district of Nairobi have joined a savings club called Mashujaa, which means "heroes" in Swahili. Each member may only contribute a few pennies a day, but it adds up. And it allows the members to make big expenditures that might be out of reach. The deal is, they have to get the whole group's consent first.