Some educators at an Illinois high school are using flipped instructional models in their science and math classes this school year. For example, students in an advanced calculus class watch short videos at home or before class of the teacher working through concepts. Then students spend class time digging deeper into the concepts. "It gives them (students) a chance to ask questions about things they don't understand," said math teacher Austin Betz. "It allows me to customize what I do in class based on what they learn from the videos."