A demonstrator is shot by a rubber bullet as anti-riot police officers charge during a protest Thursday against corruption and price hikes in Rio de Janeiro. Christophe Simon /AFP/Getty Images hide caption

itoggle caption Christophe Simon /AFP/Getty Images

Mountains in the area where Marcelo first explored the wonders of the natural world. Leonardo Pallotta/Flickr hide caption

itoggle caption Leonardo Pallotta/Flickr