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Cardboard build challenge

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Teams use only cardboard, tape and string to build the tallest tower, a bridge that holds weight or a marble run.

How to do it

  1. Collect boxes, tape and string, and set out one pile per team.
  2. Announce the challenge and a time limit of 30 to 45 minutes.
  3. Use safety scissors; adults handle any craft knives.
  4. Test each build together and celebrate the cleverest idea as well as the winner.