How virtual assistants have evolved, and why Siri lags behind the others

At any given time, most of us are within earshot of a virtual assistant. Computer scientists have been working on some of their underlying technologies for more than half a century — so why can't Apple make Siri work better? Watch the video to find out where virtual assistants came from, where they go wrong, and what the future may hold for them.
Tue, Jun 4 20195:52 PM EDT