Child preachers in Brazil are attracting large crowds and becoming celebrities, as the country's fast-growing evangelical movement gains religious and political power.

Marcel Theroux investigates the growing national scandal in South Korea of modern-day slaves, many of whom have learning difficulties and worked for years on a remote island chain.

Reporter Morland Sanders meets the aid workers trying to reunite children and parents who are trapped on different sides of the frontline in the brutal civil war in South Sudan