Door sensors detect door position (i.e., open or closed) based on the precise gap between the magnet and the reed switch.

The immune system depends on molecular alarms that detect danger inside cells. One of these alarms is STING, short for ...

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, ...