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Brazilian soldiers prepare for an operation to fight the Aedes aegypti mosquito, vector of the Zika, Dengue and Chikungunya viruses, in Sao Paulo, Brazil on February 3. The operation on Saturday will include 220,000 soldiers passing out pamphlets; they hope to reach 3 million homes. Nelson Almeida/AFP/Getty Images hide caption

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Hotels and apartment buildings line the Copacabana beach in Rio de Janeiro, Brazil. The head of a sports travel agency specializing in packages for the Rio 2016 Olympics said that the company's business could be devastated if the Zika virus continues to spread. Silvia Izquierdo/AP hide caption

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The Sand to Snow National Monument is one of three California areas designated as national monuments on Friday. Together they protect nearly 1.8 million acres of public lands. Bob Wick/Bureau of Land Management hide caption

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The head of the Russian Orthodox Church, Patriarch Kirill (left), kisses Pope Francis as they meet at José Martí International Airport in Havana on Friday. Max Rossi/AP hide caption

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An image from a simulation of two black holes merging. Courtesy of SXS Collaboration hide caption

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The Philae lander, seen here heading to a comet's surface after leaving the Rosetta spacecraft in 2014, isn't expected to send any more signals, the European Space Agency says. ESA/Rosetta/MPS for OSIRIS Team hide caption

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The Smithsonian is sharing images of astronaut graffiti aboard the Apollo 11 command module, including this tribute to the spacecraft. Smithsonian Air and Space Museum hide caption

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Democratic presidential candidates Sen. Bernie Sanders and Hillary Clinton take the stage before a Democratic presidential primary debate at the University of Wisconsin-Milwaukee on Thursday. Morry Gash/AP hide caption

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Russian Foreign Minister Sergey Lavrov (left) and Secretary of State John Kerry (second from left) attend the International Syria Support Group meeting in Munich, Germany, on Thursday along with members of the Syrian opposition and other officials. Michael Dalder/AP hide caption

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