Whatever else its faults — and it has many — one of the good things you can say about Amazon is that it employs a whole heck of a lot of American workers. At least, it does for now. CNBC reports: Amazon on Wednesday unveiled a new robotic system that's capable of performing multiple tasks at once in the company's warehouses. The system, called Blue Jay, is made up of a series of robotic arms that are suspended from a conveyor belt-like track. Those arms are tipped with suction-cup devices that allow them to grab and sort items of varying...