In March, Matt Bratlien saw something odd in the spacious suburb of Silver Firs, north of Seattle. A six-wheeled robot with the Amazon Prime logo on its sky-blue carapace was driving up and down the sidewalks and curbs, watched by a company representative. “I was surprised, excited, and very curious,” says Bratlien, a partner at Net-Tech, an IT services company in nearby Bellevue. Tom Simonite covers artificial intelligence for WIRED.

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