When Mathias Vicherat became director of Sciences Po in 2021, he vowed to prioritize efforts to prevent sexual violence and sexism.

Students at Sciences Po staged a sit-in on campus last week to demand the resignation of Mathias Vicherat, the director of the university. The banner reads, “Protected aggressors, abandoned victims, Sciences Po, paradise of impunity.”

In math, the U.S. ranked 28th out of 37 participating countries from the Organization for Economic Cooperation and Development, a group that includes mostly industrialized democracies.

Tantan Dai of China, front left, on the second day of the World Sudoku Championship in Toronto.