JUBA, South Sudan (AP) -- Close calls with crocodiles, a brutal civil war and even the death of a fellow traveler have not deterred a British man from attempting to walk the length of the Nile River. The yearlong 4,250 mile journey along the world's longest river will see the former British army captain pass through seven countries. After four months trekking through Rwanda, Tanzania and Uganda, Levison Wood is now in South Sudan, a country with little infrastructure that has been destabilized by four months of fighting between pro-...