The world can't agree on Daylight Saving Time

On Sunday, Americans turned their clocks back an hour to mark the end of Daylight Saving Time. The seasonal shuffle began in World War I, when Germany and Austria-Hungary did so to conserve energy. A century later, the world can't agree on whether changing the clocks is worth the trouble. More than 140 countries have used DST at some point, but around half have since ditched it.