Cattle and zebra share a meal in a pasture in Kenya. Ryan Lee Sensenig/Science hide caption

itoggle caption Ryan Lee Sensenig/Science

Kwame Nkrumah Masoleum is the final resting place of Ghana's first president, who led the campaign to liberate Ghana from colonial rule on March 6, 1957. neate photos/flickr hide caption

itoggle caption neate photos/flickr

A demonstrator throws a rock towards police during demonstrations in Tunis. Fred Dufour /AFP/Getty Images hide caption

itoggle caption Fred Dufour /AFP/Getty Images