They were then challenged to build a bridge out of one piece of printer paper that would hold 40 pennies. They could do anything they wanted to the paper. The only constraints were they couldn't tape the bridge to the piers or anything else and the pennies all had to be in the span and not on top of the piers. During the design challenge, they also kept a log or their designs, how many pennies the bridge held, what some strengths were and what they could improve on.
Here's what some of them did: