John Ydstie visited the University of Virginia in Charlottesville and the University of Maryland at College Park to talk to students and faculty about plagiarism. A survey shows that cheating among college students has risen dramatically in the past two years. A high percentage of that cheating involves copying material found on the Internet. Students are apparently finding it more tempting than ever to simply copy from the Web. But some professors are catching on, and Web sites are emerging to help them catch cheaters.