For years, economists have been warning that more and more people hoping to switch careers would need to get additional education to go from one workplace to another — even in industries such as manufacturing that have not always previously required it. Now that prophecy is coming true, to the surprise of many of the record number of Americans quitting their jobs. There was a time when people could walk into a manufacturing facility like a shipyard and start work the same day. Automation, computer-aided design, 3D printing, modular construction and precision machining have changed that.
