Nigerian President Mohammadu Buhari (R) shakes hand with US tech billionaire Bill Gate as Africa's richest man Aliko Dangote is seen behind, after signing an MOU to the commitment of the Abuja Agreement on Polio Eradication at the presidency in Abuja, on January 20. Bill Gates and the Dangote Foundations announced a special partnership deal to fight the menace of malnutrition ravaging some children in northern Nigeria. "The partnership will commit the sum of 100 million dollars to addressing malnutrition in Nigeria between now and 2020," Africa's richest man Aliko Dangote said. Photo : AFP