U.S. forces carried out airstrikes on Iran, calling them a retaliation for an attack on an oil tanker. Iran’s military later said it had attacked U.S. targets in Bahrain and Kuwait. Analysis ...

The common type of loudspeaker that uses a magnetic field to move a cone-shaped diaphragm. When alternating current (the audio signal) is applied to the coil, the diaphragm vibrates and causes air to ...