Machines help make our lives easier. They do work that we would find hard to do in faster, more efficient ways. A construction site is one place to observe this concept in action. Big machines move dirt and rock to clear the site, then more big machines move beams into place to form the skeleton of a building. In this original video, children learn about different machines on a construction site and the unique work each one does. This resource is part of the KET Everyday Science for Preschoolers collection.