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A Jan. 13, 2011 file photo provided by IBM shows the IBM computer system known as Watson, at IBM's T.J. Watson research center in Yorktown Heights, N.Y.
Federal Reserve Board Chair Janet Yellen speaks during a news conference on the Federal Reserve's monetary policy, Sept. 21, 2016, in Washington.
In this Dec. 3, 2009 file photo, a sign outside the Comcast Center is seen in Philadelphia.