Ionization smoke alarms use a battery and two metal plates, called electrodes, to create an electrical circuit. Ions are tiny, electrically charged particles that flow through the circuit and between ...

Smoke detectors (not just their batteries) have a temporary shelf life. Find out how long yours will last, and how to know it ...

You settle in under the duvet and get all warm and cozy, your eyes begin to feel heavy, and gradually you start to drift off ...