Progress

Nora thinks that a spatula would make a good roller coaster car.  Silas is going to cut open an aluminum can with a razor to make a seat to ride the roller coaster.  Avery is leaning toward the spatula idea, but he might try a plastic cereal bowl if he can find one.  They've collected enough cans now to complete the roller coaster, but they still don't know what to use to keep the cars on the track.  PVC pipe?  That's all they've been able to come up with so far, though they haven't been able to locate any.  Any ideas?