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Cranes fly at sunset above the Hula Valley of northern Israel in January. Millions of birds pass through the area as they migrate south every winter from Europe and Asia to Africa. Some now stay in the Hula Valley for the entire winter. Menahem Kahana/AFP/Getty Images hide caption

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Plosky Tolbachnik volcano erupts in Russia's Far Eastern Kamchatka Peninsula on Jan. 6, 2013. It's not a so-called "super volcano," but every million years or so scientists say the Earth burps up volcanoes that can erupt for thousands of years. Alexander Petrov/AP hide caption

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