Pepper Runs from Soap
Pepper races away from the soap.
Teaching & key ideas
What you do: Sprinkle pepper on water and touch soap to the center.
What students see: Pepper races away from the soap.
Why it works: Soap lowers surface tension locally and the surface pulls away.
Question to ask: Is the soap touching every piece of pepper?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Is the soap touching every piece of pepper?