On November 19, 2014, Rolling Stone published a lengthy and damning piece on the handling of sexual assault on college campuses, centering around a University of Virginia student, pseudonymously identified as “Jackie,” and her alleged gang-rape by members of one of the school’s fraternities. It was striking and stomach-turning — the attack, the response from fellow students, the response (or, more accurately, lack thereof) by university administration depicted in that story. It was also, the world would later learn, almost entirely unsubstantiated. A new report by the Columbia School of Journalism, commissioned by Rolling Stone back in December, meticulously outlines those mistakes.