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.

Send waves down a spring to watch them travel and interact.

Use index cards to show how light plus light equals dark.