Watch Duty, a free cellphone app that tracks fires, became a vital tool for millions during the 2025 LA fires.

Wearables can offer rough information about a person’s health, experts say, but only some metrics are medically useful.

In the neonatal intensive care unit, the most fragile patients in medicine are often the most heavily wired. Premature babies, some weighing less than a pound, can be tethered to a tangle of cables, ...