Drinking Bird
Bird repeatedly tips into the water.
Teaching & key ideas
What you do: Wet bird's felt head and let it cycle.
What students see: Bird repeatedly tips into the water.
Why it works: Evaporation cools the head, changing vapor pressure and moving liquid inside until torque tips it.
Question to ask: What keeps giving the bird energy to move?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: What keeps giving the bird energy to move?