http://wikieducator.org/User:Vtaylor/NASA_Summer_of_Innovation/Activities#8._File_Card_Bridge

8. File Card Bridge

The File Card Bridge, also known as Penny Bridge activity introduces kids 
to basic structures, the ideas of loading, capacity, structural failure, 
and stepwise improvements.

File card bridge / Penny 
bridge<http://www.exploratorium.edu/science_explorer/card_bridge.html>

Kidblog<http://kidblog.org/nsbbgc/028e49b6-de75-49dc-9280-3815ab18e625/file-card-bridges/>
 - 
pictures, description. kids comments

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