If you ever wondered how noise-canceling headphones works, this is the piece to read. Don’t worry, it’s short and not particularly technical, which might be a problem for some of you. It does point out why I stick to regular ol’ headphones though:

Noise-canceling headphones may offer great sound, but they do have this limitation: anything you listen to, with active noise cancellation turned on, will be affected by this hiss. Because of this, no noise-canceling headphone will sound as good as regular headphones of the same audio quality.