Amazon.com employee Rejinaldo Rosales used to wander stacks of shelves to pick up merchandise for orders before finally returning to his station to place them in bins and send them to their next stop. But this summer, squat orange robots, called Kiva, began zooming around the shelves instead, picking up goods and carrying them to Rosales at his station. The result? What used to take hours of walking can happen in mere minutes instead. While walking the aisles was "good cardio," the new system lets him get through more orders since he stands in one place, Rosales said.