Into AfricaBy: Martin Dugard In 1866 Britain's foremost explorer, Dr David Livingstone, went in search of the answer to an age old geographical riddle: where was the source of the Nile? Livingstone set out with a large team, on a course that would lead through unmapped, seemingly impenetrable terrain into areas populated by fearsome man eating tribes. Within weeks his expedition began to fall apart his entourage deserted him and Livingstone vanished without