NOVA: Using a Lever to Raise a 40 Ton Statue on Easter Island. PBS: Raise an Obelisk Put the clown in the box:  Rube Goldberg Device Group 1: Aspire Simple Machines Edheads Simple Machines Glossary of Simple Machine Terms How Stuff Works for Kids Inclined Plane Group 2: Invention Dimension Investigate and Report on Simple Machines Leonardo's Workshop Machine and Wheel from InfoCrumb Machines Make Life Easier Group 3: Moving Along with Simple Machines Screw Gears Simple Machines Construction Site (actually under construction!) Simple Machines - From the Franklin Institute Simple Machines Group 4: Simple Machines Learning Site"The purpose of this web site is to teach elementary students about the six simple machines." Snacks About Mechanics From the Exploratorium The Elements of Machines Understanding Simple Machines Wedge