New robots--smarter and faster--are taking over warehouses

A DECADE AGO Amazon started to introduce robots into its "fulfilment centres", as online retailers call their giant distribution warehouses. Instead of having people wandering up and down rows of shelves picking goods to complete orders, the machines would lift and then carry the shelves to the pickers. That saved time and money. Amazon now has more than 350,000 robots of various sorts deployed worldwide. But it is not enough to secure its future.