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, ...

Plan on a glorious extra hour of sleep as most of America "falls back" into standard time. But make sure to get outside for some morning sun, too — it'll help your body clock reset faster.Daylight ...

John Groeger does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their ...