A trader at the New York Stock Exchange watches a monitor moments before the Federal Reserve announced it would keep interest rates low through at least 2013. The news reassured investors and helped sustain a rally. Mario Tama/Getty Images hide caption

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Mario Tama/Getty Images

Federal Reserve Board Chairman Ben Bernanke may look to reassure global financial markets Tuesday. Here, he arrives for a Senate Banking, Housing, and Urban Affairs Committee hearing in July. Mark Wilson/Getty Images hide caption

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Mark Wilson/Getty Images

Note: Totals may not add up to 100 percent, due to rounding. Alyson Hurt /NPR hide caption

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Alyson Hurt /NPR

Our Cute Animal Experiment, Explained

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