Inside an armored vehicle, an Army scout uses a joystick to direct a long-range optical scope toward a man perched atop the U.S.-Mexico border wall cutting across the hills ...

The article explores the historical roots and practical applications of the 12-hour and 24-hour time formats. Originating ...

Explore the ancient mechanism some believe was built to track the end of days—and why it's still ticking after 5,000 years.