Carnival revellers participate in an afternoon parade in Ipanema neighborhood in Rio de Janeiro, Brazil. Reuters Archive.

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Interior Ministry members are on fire, caused by molotov cocktails hurled by anti-government protesters, as they stand guard during clashes in Kiev, Ukraine. February 18, 2014.

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A worker sweeps the steps in front of the Bolshoy Arena ahead of the start of the 2014 Sochi Winter Olympics, Russia. February 6, 2014.

A penguin swims at the new South Pole Spectacular, part of the Polar Adventure, of Ocean Park in Hong Kong. Reuters Archive.

A federal police officer stands on the back of a police truck while loading fuel at a petrol station in Tepalcatepec, Michoacan, Mexico. January 15, 2014.