From Thanksgiving feasts to daily workouts, here's how the AI-powered coach in the Fitbit app kept me on track and actually ...

A night-shift worker finishes at dawn. Their phone says Tuesday, but their body feels like it's Monday. The body's internal clock, or circadian rhythm, controls physiological processes such as ...

Clocks tick faster on Mars than they do on Earth, in part because Mars experiences less gravitational pull from the Sun. Now ...