This is from the pbs site
HERE ARE SOME EXCELLENT INTERACTIVE LINKS
http://www.pbs.org/wgbh/buildingbig/lab/shapes.html
http://www.pbs.org/wgbh/buildingbig/lab/materials.html
http://www.pbs.org/wgbh/buildingbig/lab/loads.html
http://www.pbs.org/wgbh/buildingbig/lab/forces.html
Check out the major types of bridges
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