Raw vs Hard-Boiled Egg Spin
The raw egg starts moving again; the cooked egg stays stopped.
Teaching & key ideas
What you do: Spin both, stop each briefly with a finger, then release.
What students see: The raw egg starts moving again; the cooked egg stays stopped.
Why it works: Liquid inside the raw egg keeps moving after the shell is stopped.
Question to ask: What is still moving inside the raw egg?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: What is still moving inside the raw egg?