Daylight saving time begins this weekend. What's behind the tradition of pushing our clocks ahead each spring?
Contrary to popular belief, no federal rule mandates that states or territories observe daylight saving time.
Justin Sullivan/Getty Images
Public domain image
From Taronga Zoo via CNN
Nobel Prize Committee/Twitter
Pascal Le Segretain/Getty Images
From Red's via CNN
Dutch National Archives
Sign up for Breaking News, Daily Headlines, Severe Weather Alerts & more!