It happens more often than you think, where core classes are staffed with rotating substitutes for weeks, months at a time, and students just give up. They don’t try. The books are there, there are lessons on YouTube, entire classes on KhanAcademy, and so on. Yet instead of using these resources to learn the material, they most often see it as a free pass to goof around and do nothing, then offer up the excuse, “we didn’t have a teacher.”