The concern for machines to replace humans, taking their jobs and making them functionally obsolete, is nothing new. Workers have worried about it for centuries, starting with the Industrial Revolution and the rise of inventions like the sawmill and the spinning jenny.Advocates for workers would argue innovative machines like these were invented solely to replace jobs previously done by humans - and there is some accuracy to these claims. The spinning jenny, for instance, was built to increase the efficiency of weaving fabric, reducing the number of workers needed to maximize mill owners' investments.