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 iconic video art piece “The Clock” is being shown at MoMA for the first time in 12 years – and a few lucky visitors will be able to spend a night at the museum on Dec. 21 to view the 24-hour ...

Here’s what you’ll learn when you read this story: Our biological clock, or circadian rhythm, is immensely important to our health, and scientists are now unpacking the process’s secrets at the ...

Could your body’s hidden 12-hour clock hold the secret to metabolic health and disease? New research links our internal rhythms to ancient ocean tides. Review: Biological rhythms: Living your life, ...