Dozens of Duke professors have posted "an open letter to the Duke community" on the Web, explaining an ad last spring that has been widely criticized as a condemnation of lacrosse players. The new letter, signed by 87 faculty and posted at www.concerneddukefaculty.org, refuses to apologize for the ad and reiterates concerns about issues of race and sexual violence on the Duke campus. It says the so-called "Group of 88" ad _ published in the university student newspaper The Chronicle last April _ has been grossly misinterpreted. That ad has been a subject of heated debate on blogs and its...