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WASHINGTON – Janet Yellen officially took over the leadership of the Federal Reserve on Monday – and along with it a delicate task: Unwinding the Fed’s extraordinary economic stimulus without spooking investors or slowing a still-subpar economy.

Yellen, the first woman to lead the Fed in its 100 years, was sworn in during a brief ceremony in the central bank’s board room. She succeeded Ben Bernanke, who stepped down last week after eight momentous years.

Bernanke is joining the Brookings Institution, a Washington think tank, where he will be a distinguished fellow in residence, Brookings announced Monday.