Shares Tumble on BlackBerry 10 Launch

Jan. 30 (Bloomberg) -- Zeb Eckert reports on today's top stories. He speaks on Bloomberg Television's "First Up." (Source: Bloomberg)

Fed's Yellen: Exploring Factors Affecting Liquidity
11:54 - Federal Reserve Chair Janet Yellen testifies before the Senate Banking Committee. She speaks on "Bloomberg Markets." (Source: Bloomberg)
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