DENVER - A teacher at the University of Colorado at Denver has resigned after the administration learned of his felony record for child pornography. Gary Schornack was with the university's business school. Until this week he taught marketing and directed the school's mentoring program. But about three weeks ago, university officials received an anonymous e-mail about Schornack's criminal history. About 15 years ago police found sexually explicit videos and photos of adolescent boys at his home in Wisconsin. Schornack pleaded no contest to child pornography, and resigned from a Milwaukee technical school. He was sentenced to four months in jail...