Polina, 37, rests in a hospital bed in St. Petersburg, Russia, in 2011. She is severely malnourished and suffers from numerous diseases, including tuberculosis, hepatitis C and HIV. Misha Friedman hide caption

itoggle caption Misha Friedman

Embattled Brazilian President Dilma Rousseff (shown here at the 21st International Construction Salon in Sao Paulo, Brazil, on Tuesday) was elected four months ago. Her administration has been hit hard by economic problems and a massive corruption scandal at the state oil company, Petrobras. Nelson Almeida/AFP/Getty Images hide caption

itoggle caption Nelson Almeida/AFP/Getty Images

Performers from the Beija-Flor samba school parade on a float during Carnival celebrations at the Sambadrome in Rio de Janeiro on March 3, 2014. That year, the Beija-Flor parade was centered on a theme of communication throughout history; this year's theme, underwritten by Equatorial Guinea, is more controversial. Felipe Dana/AP hide caption

itoggle caption Felipe Dana/AP

A demonstrator dressed as a bather protests against the rationing of water, outside the official residence of Sao Paulo's Governor Geraldo Alckmin in Sao Paulo, on Jan. 26. The banner behind him reads, "Planet Water, Dry Lives." Andre Penner/AP hide caption

itoggle caption Andre Penner/AP

Mercedes-Benz, Ford and Volkswagen workers block the Anchieta highway in Sao Bernardo do Campo. Thousands of metalworkers marched to protest layoffs by carmakers expecting little or no rebound from a sharp 2014 downturn. Adonis Guerra/Reuters/Landov hide caption

itoggle caption Adonis Guerra/Reuters/Landov

United States' Abby Wambach fights for the ball with Brazil's Bruna Benites during a final match of the International Women's Football Tournament in Brasilia, Brazil, Sunday. The game ended in a draw, giving Brazil the tournament victory. Eraldo Peres/AP hide caption

itoggle caption Eraldo Peres/AP

Brazil's President Dilma Rousseff begins to cry as she delivers a speech during the final report of the National Truth Commission on Violation of Human Rights during the military dictatorship from 1964-1985 in Brasilia on Wednesday. She is among the thousands who were tortured during that brutal period. Ed Ferreira/Agencia Estado/Xinhua/Landov hide caption

itoggle caption Ed Ferreira/Agencia Estado/Xinhua/Landov

Brazilian fruits, including jambu and tapereba (lower right), displayed for a gathering of chefs in Sao Paolo. Paula Moura for NPR hide caption

itoggle caption Paula Moura for NPR

Residents look on as Brazilian military police officers patrol Mare, one of the largest complexes of favelas in Rio de Janeiro, Brazil, on March 30. In one of the world's most violent countries, homicide rates are dropping — but only for whites. Mario Tama/Getty Images hide caption

itoggle caption Mario Tama/Getty Images

Brazil's judicial system faces a massive backlog of cases — and stacks of paperwork. One group of five judges in Sao Paulo is currently handling 1.6 million cases. G Dettmar/National Council of Justice hide caption

itoggle caption G Dettmar/National Council of Justice

A woman has her fingerprints checked with a new biometric identification machine before voting in Brasilia Sunday. More than 142 million Brazilians went to the polls, ending a dramatic campaign. Evaristo SA/AFP/Getty Images hide caption

itoggle caption Evaristo SA/AFP/Getty Images

Challenger Marina Silva (left) and incumbent Dilma Rousseff face off during a presidential debate in Aparecida, Brazil, in September. Sebastiao Moreira/EPA/Landov hide caption

itoggle caption Sebastiao Moreira/EPA/Landov

Antonio Cavalcante had a candidate for governor successfully barred after proving he had embezzled millions of dollars while he was a state legislator. Lourdes Garcia-Navarro/NPR hide caption

itoggle caption Lourdes Garcia-Navarro/NPR

The photographer Sebastiao Salgado, in New York City on Thursday, says we are at a "special moment" — our world now needs to be protected from climate change and other forces. Misha Friedman for NPR hide caption

itoggle caption Misha Friedman for NPR

Marina Silva, shown here in Rio de Janeiro on Wednesday, is tied in polls with incumbent President Dilma Rousseff. Silva, the candidate for Brazil's Socialist Party, says if elected next month, she would be "the first social environmentalist president." Silvia Izquierdo/AP hide caption

itoggle caption Silvia Izquierdo/AP