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, ...

If you’ve ever heard someone say a meeting is at 1630 and then felt your brain do a small cartwheel, you have met the 24-hour clock. In the United States, we mostly live by the 12-hour clock, with a.m ...