Different time formats might seem baffling at first, but the 12-hour and 24-hour clocks each tell fascinating stories about how we've measured our days throughout history. The familiar 12-hour system, ...

The aides want the New York City Council to pass a law that would limit their shifts to 12 hours, except in the case of emergencies. By Wesley Parnell For 10 years, Xue Zhen, a home health aide, has ...