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

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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

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

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