Why big tech thinks voice control will conquer the world

Every year, a conspicuous theme emerges as the "new thing" in the tech world: drones, wearables, self-driving cars, whatever the latest trend is. But at this year's Consumer Electronics Show, the prominent trend was mostly invisible: voice control. It seemed like half the new products announced, whether they were TVs, kitchen appliances, or smart displays, all contained a voice assistant. Perhaps this shouldn't be surprising. This holiday season, Amazon and Google in particular...