Military time, also known as the 24-hour clock, is a system the military uses to eliminate confusion between morning and afternoon hours, since the armed forces are in operation around the clock.

The mechanism of the simplest biological 24-hour clock Circadian clocks, the biochemical oscillators that are controlled by the day–night cycle, have a central role in many biological processes.

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 ...

The model revealed that clock stability improves with a higher concentration of proteins, suggesting why organisms might stockpile large quantities of these molecules to keep time reliably.

The U.S. military uses 24-hour military time to avoid confusion between a.m. and p.m. The Navy started using it in 1920, and the Army adopted it in 1942.