The robots are small, wheeled boxes short enough to slip under a shelving unit and lift it up. The navigation system is simple, involving stickers on the floor, optical sensors, and Wi-Fi connections.

Amazon's millionth robot was recently deployed in one of its fulfillment centers in Japan, the company writes. As noted by The Wall Street Journal, this means ...

Warehouse collapses like dominoes after forklift driver crashes into unit Lucy Middleton. ... while four of the shelving units have also been completely wiped out.