Artificial intelligence (AI) has landed on Earth like an alien spacecraft from a science fiction novel. We now have self-driving cars; computers that can diagnose illnesses, recommend treatments, and predict and solve crimes; smart phones that can route us from point A to point B; gadgets that can understand and respond to spoken commands; and much more. All of this is made possible by machine learning (ML). Although AI and ML can be used to help us answer questions and solve problems, for...