Chain reaction school project - 2019

Two easy chain reaction projects which my son and a friend did for a grade 7 school project, the first one is a sandwich maker, the second one raises a flag, they had so much fun building these!
Are you looking for Ideas?
These two easy chain reaction projects was so much fun to do!

[@brofessordex1424]

How did u do the first one with the tube. It's like an air pump right or something else?

[@rushdaamjad]

Very interesting

[@17ForLuck]

This game me testicular cancer

[@heinrichgrove]

Whahahaha!

[@anatambo728]

si xxdd

[@shultzy_5463]

Stop

[@M00ki]

Stop what?