We present a teaching unit on liquid crystals. The unit has already been implemented into the university undergraduate pedagogical study programs for future teachers of Physics and Chemistry, preschool teachers and teachers at the lower grade of the elementary school at Faculty of Education, University of Ljubljana. The unit develops students' knowledge on the existence of more than three phases of matter and the existence and properties of anisotropic materials, focusing on the biaxiality and birefringence. The unit is multidisciplinary since students perform the experiments with the MBBA nematic liquid crystal which they synthesize themselves. Our final goal is to implement the teaching unit to the high school curriculum (for students 14-18 years old).