A trader walks in New York City's financial district on Sept. 12, a day when stocks fell early based on fears that the Greek government would default, then rallied on news that China might buy Italian debt. This year, what sent the market into a tailspin often took place overseas. Spencer Platt/Getty Images hide caption

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A homeless man begs for money during the launch of Christmas celebrations in Athens' central Syntagma Square, Dec. 9. Difficult economic times have meant subdued holiday activities — and even carolers, who traditionally receive money for their songs, are feeling the pinch. Louisa Gouliamaki/AFP/Getty Images hide caption

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Experiences in youth shape our health in old age. That's the key lesson from the world's longest-running medical study. iStockphoto.com hide caption

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A woman gazes into a shop window in downtown Rome. Due to tough austerity measures, even wealthy Italians are buying less this holiday season. Max Rossi/Reuters hide caption

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A "mind the gap" reminder at the Acton Town Underground Station in London carmen_seaby via Flickr hide caption

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