Ryan Battle (left) speaks at the Rally for DC Lives in Folger Park in Washington, D.C. Emily Pemberton (right) participates at the "March for Our Lives" protest. (Eric Lee/NPR)

(Top) Students and anti-gun protesters rally in Washington, D.C. (Bottom left) Sophie Colson wears her "End Gun Violence" jacket. (Bottom right) Ava Amirkhalili, 15, (Cheryl Diaz Meyer for NPR)

(Top) A group of young demonstrators heads from a Black Lives Matter DC gathering to the "March for Our Lives" in Southeast D.C. (Bottom right) Lauren Renford speaks at the Rally for DC Lives.

Esther Obioha (left) and Amelia Tydings of Montgomery Blair High School in Silver Spring, Md., hugged as they joined hundreds of thousands of students.