When it comes to the job market of the future, it’s often been said that most children starting school will have jobs that don’t exist yet. That’s particularly true for high-tech occupations, which continue to evolve, and there aren’t too many jobs that are done the same way now as they were a few decades ago. On the other hand, most skilled trades operate in more or less the same way as they did during prior generations. They might be using more modern tools and materials, but the process of building a home, installing electrical systems, and paving a highway hasn’t changed much. And household plumbing still works the same way that it did in the middle of the 19th century!