Dumbing Down Watch

There is a "cheating" scandal at Harvard. Apparently, students were given an open-book, open-anything take-home exam for 'Introduction to Congress' and were not expected to consult each other in any way.
 

Harvard College’s disciplinary board is investigating nearly half of the 279 students who enrolled in Government 1310: “Introduction to Congress” last spring for allegedly plagiarizing answers or inappropriately collaborating on the class’ final take-home exam.
Dean of Undergraduate Education Jay M. Harris said the magnitude of the case was “unprecedented in anyone’s living memory.”
Harris declined to name the course, but several students familiar with the investigation confirmed that Professor Matthew B. Platt's spring government lecture course was the class in question.
The professor of the course brought the case to the Administrative Board in May after noticing similarities in 10 to 20 exams, Harris said. During the summer, the Ad Board conducted a review of all final exams submitted for the course and found about 125 of them to be suspicious.

Presumably this is not the only take-home exam in Harvard and presumably not the first for this course. So why now has half the class felt compelled to plagiarise or to collaborate inappropriately?

Has the course become more difficult than it used to be? Or are the students less capable? Or have admission standards become less rigorous?

Maybe QS and Times Higher were on to something after all when they dethroned Harvard from the number one spot in their world rankings.