JEREMY WALKER / SCIENCE PHOTO LIBRARY JEREMY WALKER / SCIENCE PHOTO LIBRARY
Favela in Rio de Janeiro, Brazil. In the foreground are buildings in a favela (shanty town), with more affluent high-rise buildings in the background. Rio de Janeiro, Brazil's second-largest city as of 2014, has a population of over 6 million. Around one-fifth live in the favelas, which are found mostly on the slopes of Rio's coastal mountains and hills. Photographed in July 2012.
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