Obama in Ethiopia on Africa tour to boost security, other ties
Ethiopia has won praise for spreading development with range of rural health programmes and other initiatives across nation
U.N. asks South Sudan to allow aid flows on Nile
River was lifeline for aid recipients until government put restrictions on its use
Study throws doubt on education benefit of deworming children
'Deworming' is the removal of parasitic worms which affect millions of children in developing countries
Fighting stops aid reaching starving South Sudan children-charity
Thousands of people are living in "inhumane conditions" in northern South Sudan
South Sudan rebel leader fires top commanders
Successive peace talks have failed, but officials say progress has been made at the latest round of discussions
South Sudan government forces commit war crimes in Unity-rights group
Government forces killed scores of civilians, carried out public gang rapes and burned people alive
'Videogame' violence shows children get little aid in war zones
Video aims to raise awareness of the small proportion of humanitarian funding spent on protecting children in war zones
Actor George Clooney seeks to expose funding of Africa conflicts
U.S. actor launches initiative to fight corruption in war zones
Amid spat with ICC, Habre trial raises hope for African justice
Former Chadian dictator Hissene Habre is blamed by rights groups for widespread torture and the killing of up to 40,000 people