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Resonance – This 30 minute long video from The Mechanical Universe series demonstrates the concept of resonance using the notable Tacoma Narrows Bridge disaster. (Note: there is some consensus by experts that resonance was not the cause of the Tacoma Narrows Bridge disaster, but instead a concept called aeroelastic flutter, which is too complicated to discuss in this class. That said, this video is still very interesting and has lots of good scientific information about resonance.)

Acoustic levitation – Styrofoam beads are levitated in the interference patterns created in sound waves.