Super easy group project- Exploding Popsicle Sticks! All you need is about 50 (or more!) wide popsicle sticks and at least one assistant. Just stand back, they pop up fast! (Regular speed and slow motion video below!) Directions, with photos can be found here- https://frugalfun4boys.com/2013/05/13/build-a-chain-reaction-with-popsicle-or-craft-sticks/

Thank you to Kayla for this post!