2. “We deserve to live without fear.”

Thousands of students across the country walked out of their classrooms to mark the 19th anniversary of the mass shooting at Columbine High School in Colorado. Above, a protest in Washington.

The students said political leaders hadn’t done enough to ensure their safety, despite the many school shootings since.

The latest one took place just an hour before the walkout, in Ocala, Fla.: A 19-year-old with a gun entered a high school and shot a 17-year-old, who was expected to survive.

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