Probably the last man who knew how it worked had been tortured to death years before. Or as soon as it was installed. Killing the creator was a traditional method of patent-protection.
Terry PratchettThe baby boomers are getting older, and will stay older for longer. And they will run right into the dementia firing range. How will a society cope? Especially a society that can't so readily rely on those stable family relationships that traditionally provided the backbone of care?
Terry Pratchett'Educational' refers to the process, not the object. Although, come to think of it, some of my teachers could easily have been replaced by a cheeseburger.
Terry Pratchett