The world we live in would be nothing like it is today were it not for the internal-combustion engine. In 1885, Gottlieb Daimler built an internal-combustion engine that is widely viewed as the prototype of the modern gas engine, and Karl Benz built the first practical automobile powered by an internal-combustion engine, ushering in a new era in transportation. Today, internal-combustion engines are used to power everything from cars and trucks to locomotives, ships, and jets. How do they work? Discuss