In Every Nation Everywhere, older adolescents are most likely to protest against government authority. (left) Younger adolescents in Alabama celebrate the 50-year anniversary of the historic Selma-to-Montgomery march across the Pettus Bridge. In that historic movement, most of those beaten and killed were under age 25. (right) In the fall of 2014, thousands of students in Hong Kong led pro-democracy protests, which began peacefully but led, days later, to violent confrontations, shown here as it began.