North Central Middle School students in Mrs. Stogner’s seventh grade science class had a guest visitor from the University of Notre Dame. Emily Amenson, a Ph.D candidate in Analytical and Physical Chemistry at Notre Dame, challenged students to learn all while having fun doing it. “The students loved learning more about acids and bases using indicators (litmus paper, ph paper and phenolphthalein) in order to determine relative ph,” said Stogner.