In Rio’s largest favela, used oil becomes soap and...
                             
                            
                                                            Rocinha, in the south of Rio de Janeiro, is, according to official data, the largest of Brazil’s more than 12,000 favelas, or inner-city communities. It has a population of just over 72,000, and the most occupied homes of any favela — more than 30,000. Rocinha sprang up in the early 20th century, but its population […]
                                                        
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