How Amazon Taught the Echo Auto to Hear You in a Noisy Car

Dhananjay Motwani is thinking of an animal, and his 20 Questions opponent is, question by question, trying to figure out what it is. "Is it larger than a microwave oven?" "Yes." "No." "Is it a vegetarian?" "Yes." What's impressive here isn't that the questioner is a computer; that's old hat. It's that the machine and Motwani are chatting in his blue Hyundai Sonata, trundling along one of Silicon Valley's many freeways.