Google Home and Amazon’s Alexa have been catching on very quickly. Google reports that it sells a voice-controlled speaker every second. While this could just be a fad, some analysts argue that the voice-activated speakers may mark the biggest shift in consumer technology since the smartphone. “Humans don’t really communicate that effectively using text,” says Richard Watson, a futurist in London. Vocal computing should speed up a lot of queries, given that most people can speak much faster than they can type. What has voice-control changed? What are the new opportunities vocal computing will offer?