Sitemap http://www.knex.com Copyright 2012. All Rights Reserved Build 13 different bridge models one at a time. Set includes building instructions with real life photos and key facts. Models demonstrate 7 key bridge types beam truss arch cantilever suspension cable stayed and movable bascule. 207 K NEX Rods and Connec... http://www.knex.com/Educators/structures_bridges.php Builds 7 different replicas of real world models one at a time. Set includes color coded building instructions with real life photos and key facts for each model. Models demonstrate 2 spur gear examples 2 crown gear examples and 2 sprocket gear examples. ... http://www.knex.com/Educators/simple_machines_gears.php Build 7 different replicas of real world models one at a time. Set includes building instructions with real life photos and key facts for each model. Models demonstrate how a wheel turns an axle how an axle turns a wheel 2 levels of inclined planes the sc... http://www.knex.com/Educators/simple_machines_wheels.php Build 8 different replicas of real world models one at a time. Set includes building instructions with real life photos and key facts for each model. Models demonstrate 1st 2nd and 3rd class levers along with fixed movable and combination pulley systems. ... http://www.knex.com/Educators/simple_machines_levers.php