Aid workers use a visual aid to give lessons on sanitation to people living in a makeshift camp for the internally displaced on the outskirts of Baidoa town, the capital of Bay region of south-western Somalia where the spread of cholera has claimed tens of lives of IDP's escaping drought from areas cut-off to emergency aid by al-Shabaab islamists on March 14, 2017. The United Nations is warning of an unprecedented global crisis with famine already gripping parts of South Sudan and looming over Nigeria, Yemen and Somalia, threatening the lives of 20 million people. For Somalis, the memory of the 2011 famine which left a quarter of a million people dead is still fresh. / AFP PHOTO / TONY KARUMBA