“You’ve got to put your bodies upon the gears and upon the wheels, upon the levers, upon all the apparatus, and you’ve got to make it stop,” he said. Soon the students would flood into a campus administration building.

That scene played out 60 years ago at the University of California, Berkeley. The words were directed at the university leadership, and referring to its restrictions on campus political activity. But the speech, from the student leader Mario Savio, and the sit-in that followed could have happened yesterday.