[from 2 weeks ago:](https://www.reddit.com/r/explainlikeimfive/comments/1euodf3/eli5_how_do_noise_canceling_headphones_work/)
“Basically they listen to the world through microphones and add the opposite sounds to the music you listen to. If the sound is +1 the headphones add -1, which results in 0, or no sound. They can’t perfectly capture the sounds in the world, so they can’t perfectly negate them. You also hear sound through your skull and even mouth, and the headphones can’t negate that either. This why they can’t eliminate all sound, but they do make a substantial difference.”
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