The history of daylight saving time and its effect on our health

This weekend, nearly all of us will set our clocks back one hour. It's part of the twice-a-year ritual of alternating between daylight saving time and standard time. William Brangham looks at the history of changing the clock and a movement to do away with this process, once and for all.
Editor's Note: This report contained an error in that it misspelled Senator Patty Murray (D-Washington) name in the lower third font. We apologize for the mistake.
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