Although commonly referred to as the “check-engine light,” some cars may instead display the message “Service Engine Soon,” or show a yellow or orange outline of an engine, perhaps with ...

Hybrid cars use two different power sources, typically a gas-powered engine and an electric motor. Hybrid cars use one or both power sources for motivation, often using the electric motor at lower ...

Heron, the great inventor of Alexandria, described in detail what is thought to be the first working steam engine. He called it an aeolipile, or "wind ball". His design was a sealed caldron of water ...