Lester Lum Colbert is a handsome, rugged Texan with a quick smile, a quicker tongue and a big hello for everyone. At 45, he is president of Chrysler Corp., the second largest automaker in the world.

A Stirling engine is an external combustion engine that runs on the expansion and contraction of gas within a sealed system. In this video, we break down how it works, from heating and cooling cycles ...

A team of researchers including Princeton computer scientists has developed a new tool that simplifies the process of animating still images, such as this diagram of an external combustion engine.