Cheating scandal shakes Mexico's top university

Mexico's largest university is in an admissions crisis after its first fully online entrance exam produced unusually high scores and allegations of cheating. Now, tens of thousands of applicants are being asked to take the test again - including students who may have earned their spots fairly. The scandal is also exposing a deeper problem: fierce competition for a limited number of places at Mexico's most prestigious public universities. The World's Tibisay Zea reports.