Christian families are leaving Iraq in large numbers amid continuing sectarian violence, Jim Muir has the latest developments. John Humphrys travels to China and finds political perils threaten the country's booming economy. In South Africa, Hamilton Wende hears tales of horror and victory from a veteran of the Battle of El Alamein. Lina Sinjab finds youngsters in Yemen disturbed by the way the world views their country. And in the Maldives, Tim Ecott witnesses the massing of the manta rays.