Here is the chain reaction from the Scottish class, in Yester Primary School. The whole class took part in many tests, as the children thought about how they could create something completely on their own, and finally seven boys were chosen to create the end result. They had help and advice from the other pupils too.
We hope you enjoy watching the video, and we certainly look forward to seeing all the other chain reactions when we come back to school next week.
Good luck to all the competitors!