Professor of Mechanics, Washington University, St. Louis, Mo. It's easy to construct finite-element models with errors. And it's just as easy to correct them, when you know how. The first step in a ...

Clutches intermittently engage machines drives with driven parts. They’re used extensively in industrial machinery as well as in passenger vehicles where they connect engines to gearboxes. For the ...

One of the most important steps in the evolution of modern mammals was the development of highly sensitive hearing. The middle ear of mammals, with an eardrum and several small bones, allows us to ...