Paper-airplane lab
Make four different planes. Race for distance and accuracy. Iterate.
yrs: 6-14
Plays in: 30 min
Outz on completion: 5
Materials: paper
How to make it
Find four different paper-airplane folds online or in a book. Make one of each. Test from a fixed start line: distance flown, hit a target. Pick the best, modify it, test again. Keep notes on what changed. The kid will, without prompting, start saying "hypothesis".