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    Same person, doing same thing?

    I once heard somewhere that due to some physics theory, there is someone out there in the universe doing exactly the same thing as you and looking exactly the same as you. I cant remember the details though... Anyone heard of this before and can clarify? I don't think it seems plausible though..
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    Question on timbre (Sound waves)

    Homework Statement Explain why different instruments produce sounds of different quality. Homework Equations None. The Attempt at a Solution Different instruments produce sounds of different quality as they produce sound waves with different waveforms. -----------------------...
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