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Parametric Resonance is when one parameter of an oscillator is varied at the right frequency to cause the amplitude to increase. Autoparametric Resonance is when that happens automatically!

Here's my video on resonance:    • A better description of resonance  
Here's my video about an upside down pendulum:    • Upside down pendulum  
Here's my video about a levitating liquid pendulum:    • The Levitating Liquid Pendulum  

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