Dyson has announced its most unusual product yet; a wearable air purifier with a pair of noise-cancelling headphones built in. An initial reveal of the Zone headphones - the first headphones Dyson has released - doesn't come with many specifics about cost or battery life, nor how much the headset weighs. Where did this come from? Dyson said it started having internal conversations in 2016 about developing some kind of "purification on the move" technology, based on its existing air purification technology. During initial trials in the smoggy city of Beijing the company struck upon the idea of integrating noise-cancelling headphones. Doing this also meant the company was able to design the headset so the air filters could be placed...