The Mechanical Engineering subject guide will direct you to the best sources for doing library research in Mechanical Engineering...
"The branch of engineering concerned with the design, construction, operation, and maintenance of machines and mechanical implements." - Oxford English Dictionary
"An engineering discipline that involves the application of principles of physics and chemistry for analysis, design, manufacturing, and maintenance of various systems." - Wikipedia (as of 08/04/2009)

A dust mite, sitting on a MEMS (microelectromechanical system) device.
Courtesy of Sandia National Laboratories, SUMMiTTM Technologies, www.mems.sandia.gov