When you picture a metal detector, you probably imagine a device that has a long shaft with something that looks like a small steering wheel attached to the bottom end. The user walks along the beach, ...

Walk-through metal detectors are common security tools. They use low-frequency electromagnetic fields. These fields interact briefly with metal objects. Health agencies confirm these detectors use non ...

Modern smartphones are packed with a wide range of sensors, and their magnetometer can successfully identify certain kinds of ...