Two short and snappy videos from MIT feature simple bridge designs, with Lego-men being experimented upon:

5_Steps_to_Building_a_Model_Bridge

popsicle-stick-bridge

More links:

http://web.archive.org/web/20091212223730/http://www.pbs.org/wgbh/buildingbig/index.html

http://www.garrettsbridges.com/

http://mathcoachblog.com/2013/05/20/lets-build-some-bridges/

http://www.wikihow.com/Build-a-Popsicle-Stick-Tower

The concept and many guidelines came from the site TryEngineering, which provides many neat and simple tasks for kids to encourage creativity and discovery

 

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