I’m not sure what speed I was doing when I crashed, but I remember how fast my heart was beating. It was my fault, too. On my fourth or fifth lap I’d gone too hard through the sweepers. The back had ...

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 ...