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Send waves down a spring to watch them travel and interact.
Demonstrate diffraction using a candle and two pencils.
Test your vision—just by moving your head.
Imperfect alignment can lead to interesting patterns.
Air trapped between two pieces of clear plastic produces rainbow-colored interference patterns.
Model the behavior of light reflecting off soap film surfaces.
Why do we see colors in soap bubbles?
Gravity turns soap film into an ever-shifting, colorful masterpiece.
Demonstrate resonance by shaking dried spaghetti.
Light plus light equals dark.
Use index cards to show how light plus light equals dark.
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Attribution: Exploratorium Teacher Institute
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