Testing the walls

We are up to the exciting day in the Bernie Zubrowski book, "Messing About with Drinking Straw Construction," when the kids make different walls out of straws and paper clips, (and carefully placed straight pins, placed by the grown ups)
Then test them for strength with nails in paper cups,

This one took 348 nails to knock down.
One Dad walked past on his way to rocketry class, and estimated how many nails the wall could hold up that had 4 studs.  He was really close.