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From tree trunk to cable-stayed bridge You are standing in front of a stream and want to cross to the other side. It seems silly, but the stream is just wide enough that you can't jump over it. Now you could take off your shoes and socks and wade through - it's cold and very dangerous if the current is strong. You also don't know how deep the stream really is. You walk up and down the stream and look for a bridge or materials to build a bridge. A few large stones, a tree trunk How are real bridges actually built? Contents: Bridge building; Rolled bridge reinforcement; Bridge arch; The trick with the arch; Building an arch bridge from clay; Catenoid bridges; Inca bridges; Suspension bridge the queen of bridges; Cable-stayed bridge; Truss bridge; Reinforced concrete cantilever bridge; Three-beam bridge; Four-board bridge; Leonardo bridge, an ancient idea; Tensegrity; Folding bridge; Bridge builder's lexicon Experiment kit from 10 years Cardboard box: 33 x 23 x 5 cm Weight: 1.3 kg
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