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- Building Big - WGBH Educational Foundation
Explore great feats of engineering and the ingenuity of the engineers, architects, and builders who designed and built them. Learn about bridges, domes, skyscrapers, dams, and tunnels; use Flash interactive engineering labs to experiment with forces, materials, loads, and shapes; take on the challenges of building big; visit wonders of the world, a databank of big structures; investigate big structures near you; and find out what's cool about being an engineer. The Educator's Guide offers hands-on activities. Based on a five-part PBS television series from WGBH Boston, and hosted by author-illustrator David Macaulay.
An AutoCAD CAD Shareware Clearinghouse, offering a collection of over 4,000 shareware programs for CAD engineers, designers, graphics people, etc. Also a very large free 2d and a minimal-cost 3d parts library with hard-to-find parts.