M&M Color Diffusion
Colored bands spread without stirring.
Teaching & key ideas
What you do: Arrange candies, add shallow water, and wait briefly.
What students see: Colored bands spread without stirring.
Why it works: Sugar/coloring dissolve and diffuse outward through the water.
Question to ask: Why do the colors move on their own?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Why do the colors move on their own?