Tyler and I are halfway done. This is what we have so far:

Basically, a Nerf gun shoots a Nerf bullet which hits some dominoes that push a small, clay ball which goes into a pipe and falls into a cup which pulls up a peg that was stopping a toy truck so the toy truck hits a golf ball which goes down a ramp. How many reactions was that? So far we have been pretty productive. We have only built for like 2 and a half hours and we are already halfway done. We plan to finish building Wednesday, January 25. When building, we realized that our first step would not work. The plan was to have one end of a string attached to the trigger of the Nerf gun, and the other to a mousetrap. This didn’t work because the string was not strong enough. To make up for this step, we will add another one when there is a chance.