An American education professor, one of the founders of a radical 1960s group known as the Weather Underground, which was responsible for a number of bombings in the United States in the early 1970s, was turned back at the Canadian border last night. Dr. William Ayers, a professor of education at the University of Illinois-Chicago and a leader in educational reform, was scheduled to speak at the Centre for Urban Schooling at University of Toronto's Ontario Institute for Studies in Education. But that appearance has now been temporarily cancelled. "I don't know why I was turned back," Ayers said in...