Balloon Skewer Trick
Skewer passes through without popping the balloon.
Teaching & key ideas
What you do: Push skewer slowly through thick areas near knot and opposite end.
What students see: Skewer passes through without popping the balloon.
Why it works: Stretched rubber polymer chains can seal around the skewer where tension is lower.
Question to ask: Why doesn't it pop there?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Why doesn't it pop there?