Why does Nigeria’s electricity supply keep collapsing?

Despite being an energy-rich country, Nigeria has been experiencing widespread blackouts and power cuts. We hear from the former boss of the Nigerian Electricity Regulatory Commission on what needs to be done to fix the national grid. Also, we meet the lawyer who defies threats of violence, to defend people sentenced to death for blasphemy under Sharia law. And what is the best way to handle cyberbullies? We hear a personal account of being abused online, and get a few tips from an anti-bullying campaigner.