Whatever your job decades of research show that you achieved mastery by working with someone who knew more than you did. Today, this essential bond is under threat. In our grail-like quest to optimize productivity with intelligent technologies like AI and robots, we are separating junior workers from experts in workplaces around the world. It’s a looming multi-trillion-dollar problem that few are addressing, until now. In this book, researcher and technologist Matt Beane reveals the hidden code that underwrites every successful expert-novice relationship. Beane has spent the last decade examining this unique bond in a variety of settings, from warehouses to surgical suites. He’s found that just as the four amino acids are the building blocks of DNA, the three C’s—challenge, complexity, and connection—are the basic components of how we develop our most valuable skills.