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Pianos can't be perfectly tuned - it's a mathematical fact!
Thanks to audible.com/minutephysics for supporting MinutePhysics.

Equal tempered tuning: en.wikipedia.org/wiki/Equal_te...

Just Tuning: en.wikipedia.org/wiki/Just_int...

Harmonics: en.wikipedia.org/wiki/Harmonic

Pythagorean vs Just Tuning: youtube.com/watch?v=QaYOwIIvgH...

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Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute!

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