4.2+Strengthening+Materials+to+Improve+Function+and+Safety

=**why the bridges failed! interactive:**=

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= = =**Corrugation strengthens flat materials (like paper and cardboard):**= media type="youtube" key="M7QpukKWsOs" height="315" width="420"

=**Lamination strengthens matherials:**=

http://en.wikipedia.org/wiki/Lamination

=**Reinforced Concrete:**=

http://civilbasics.weebly.com/2/post/2011/10/advantages-of-rcc-reinforced-cement-concrete.html