Earlier this month, Rebecca Segal, a kindergarten teacher in Milwaukee, walked into her classroom, counted the number of students in front of her, and thought to herself, “This is going to be a great day.” Typically, Segal teaches around 30 kids, but a blizzard and frigid temperatures, while not severe enough for an official snow day, kept more than half her students at home. With only 12 kids in her classroom, Segal knew right off the bat that things were going…