The other night my wife and I attended a PTA fundraiser for our older daughter’s elementary school, and during the course of things I got to talking to the father of one of our daughter’s best friends. He’s a fifth-grade teacher in our school system with a passion for math and science who runs an after-school Lego robotics club, and who has been teaching long enough that his first class of students is graduating high school this year. One of them, he said, recently visited her old grade school and told him that he was her favorite teacher and that thanks to him she was planning on studying physics or chemistry in college. Part of what she remembered so fondly was the Lego robotics club.