Today on Planet Money:
-- President-elect Barack Obama begins his first 100 days in office on Tuesday. Historian Eric Rauchway guides us through the first 100 days by which all other 100 days are measured — the start of Franklin Delano Roosevelt's presidency. Rauchway is the author of The Great Depression and The New Deal: A Very Short Introduction.
-- Listener Nathan Fiala says he's found a bright spot in the dismal U.S. economy. It's his hometown, Grand Forks, North Dakota.
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