An analogue clock, a clock with hands, shows the numbers 1 through to 12. It is a 12-hour clock. The first 12 hours of the day, from midnight to midday, are called am. The next 12 hours, from midday ...

The Material Design team has an interesting blog post into what it calls the “24-hour Clock Design Challenge” that chronicles Google’s work creating a time picker for those that use a 24-hour format ...

Circadian clocks, the biochemical oscillators that are controlled by the day–night cycle, have a central role in many biological processes. The mechanism underlying the earliest form of such ...

The clock going back for winter is far less disruptive than the spring shift, which has been linked to spikes in heart attacks and traffic accidents. Every year, as clocks go back in October, millions ...