Photography : Goats and Soda Photography

A group of older boys, some of whom are gang members, joke around with a younger boy. Neighborhood children are often groomed for gang activity from the age of 6 or 7. At first they may be given small assignments — like buying snacks for gang members or monitoring who's coming in and out of a neighborhood, says Ayuso. Bit by bit, he says, they graduate into bigger responsibilities. Tomas Ayuso hide caption

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Tomas Ayuso

Photographer Lorenzo Vitturi assembled this collage of products sold at the street market of Lagos Island, Nigeria, including the T-shirt that gave him the title for his new book: "Money Must Be Made." Lorenzo Vitturi hide caption

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Lorenzo Vitturi

A young white rhino, drugged and blindfolded, is about to be released into the Okavango Delta in Botswana. It was relocated from South Africa to protect it from poachers. Neil Aldridge/World Press Photo hide caption

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Neil Aldridge/World Press Photo