Glow Stick Warm vs Cold

1. Glow Stick Warm vs Cold Materials: Two glow sticks; warm and cold water What you do: Place activated glow sticks in different temperatures. What students see: Warm glow stick looks brighter but fades faster. Question: Does brighter mean it will last longer? 2. Memory Foam Temperature Test Materials: Memory foam sample; cool pack; warm hands What you do: Compress cooled and warmed areas. What students see: Warm foam recovers faster than cool foam. Question: Why does the same foam behave differently? 3. Shape-Memory Wire Returns Materials: Nitinol wire preformed shape; cool/warm water What you do: Bend wire cool, then warm it. What students see: Wire returns toward its trained shape. Question: How can metal 'remember' a shape?

Predict → observe three demonstrations → compare what changed → choose independent activity station → cleanup/share. Guiding questions: Question: Does brighter mean it will last longer? Question: Why does the same foam behave differently? Question: How can metal 'remember' a shape?