INDIANAPOLIS -- It's known nationwide for rolling back prices. Now Wal-Mart is rolling back something else: its hours. At select locations in markets across the United States, the nation's largest ...

Armies started using the 24-hour method of timekeeping as standard military time because, much like police, fire, and medical departments, every branch of the armed services is in continuous operation ...

U.S. regulators approved the nation’s first 24-hour stock exchange on Wednesday, marking a significant shift in American securities trading as retail investors increasingly demand round-the-clock ...

Splicing together footage from more than 12,000 films, Christian Marclay’s cinematic masterpiece might be the most complex clock ever built. (It’s definitely one of the most mesmerizing.) ...

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 ...