PROVO — A Brigham Young University assistant professor has resigned after being arrested Thursday night for investigation into allegations that he taped and watched pornographic videos of a 14-year-old girl on his computer. The 63-year-old man is being investigated for sexual exploitation of a minor, a second-degree felony, and voyeurism, a class-A misdemeanor, after Provo police found a video clip of a girl undressing on a laptop computer belonging to BYU. The Deseret Morning News does not name arrested persons until charges are filed. Acting on a tip, Provo police approached the man at his home and took him to...